10 11 12 OBJECTIVE: To explore how plant, gender, and the time after stroke onset influenced improvements in the quality of life of patients in a gardening program.. Quality of life impr
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DOI:10.3233/WOR-162338
IOS Press
The effects of gardening on quality of life
in people with stroke
1
2
Fen-Ling Kuoa, Sui-Hua Hoa,b,∗and Chiuhsiang Joe Linb
3
aDivision of Occupational Therapy, Department of Physical Medicine and Rehabilitation, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
4
5
bDepartment of Industrial Management, National Taiwan University of Science and Technology, Taipei, Taiwan
6
Received 20 November 2014
7
Accepted 15 June 2015
8
Abstract.
9
BACKGROUND: Compared with traditional rehabilitation, gardening has been viewed as a more occupation-based
inter-vention to help patients improve functional performance However, there is still a need for evidence-based research into what factors interact to create the beneficial effects of gardening for people who have sustained a cerebral vascular accident (CVA)
10
11
12
OBJECTIVE: To explore how plant, gender, and the time after stroke onset influenced improvements in the quality of life
of patients in a gardening program
13
14
METHODS: One treatment of tending short-term plants, and another treatment of tending long-term plants were compared.
Quality of life improvement was evaluated according to three factors: plant, gender, and the time after stroke onset The data were analyzed with 2kreplicated factorial designs
15
16
17
RESULTS: The 2kfactorial design with replication indicated significant effects on both the social role and the family role For the social role, the interaction of plant and gender difference was significant For the family role, the significant effects were found on interaction of plant with both gender and the time after stroke onset
18
19
20
CONCLUSIONS: Tending plants with different life cycles has varied effects on the quality of life of people who have
sustained a CVA Factors related to gender and the time after stroke onset influenced role competency in this sample
21
22
Keywords: Occupational therapy, cerebrovascular accident, horticultural activity, 2kfactorial design, occupation
23
1 Introduction
24
1.1 Background
25
A cerebral vascular accident (CVA) usually results
26
in a decline in physical, mental, and/or cognitive
27
abilities, those influence functional performance
out-28
∗Address for correspondence: Sui-Hua Ho, Division of
Occu-pational Therapy, Department of Physical Medicine and
Rehabilitation, Shuang Ho Hospital, Taipei Medical University,
No 291, Zhongzheng Rd., Zhonghe, Taipei 23561, Taiwan Tel.:
+886 2 22490088 ext 1624; Fax: +886 2 22490088 ext 1634.
E-mail: D10101001@mail.ntust.edu.tw, shh283@nyu.edu.
comes The physical changes after the disease [1] and 29 the psychosocial changes within the working envi- 30 ronment [2] in turn brought the occupational stress 31 and influenced the work engagement of people [3] 32 Wang, Kapellusch [4] mentioned that the CVA recov- 33 ery, especially in perceptive, speech, and cognitive 34 domains, was a critical factor of returning to work 35 Alcˆantara, Sampaio [5] also found that health con- 36 dition would influence work ability profoundly The 37 consequences after CVA can impact the quality of 38 life (QoL) of not only patients [6] but also caregivers 39 [7] Traditional rehabilitation has provided patients 40 with many opportunities to improve their sensorimo- 41
1051-9815/16/$35.00 © 2016 – IOS Press and the authors All rights reserved
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tor, cognitive, and mental health However, the use
42
of repetitive and long-term rehabilitative programs
43
may discourage patients from consistently and
con-44
tinuously returning for follow-up care
45
The therapeutic garden has been viewed as a
nat-46
ural and pleasant intervention setting for improving
47
quality of life (QoL) in the elderly [8] Gardening
48
has been utilized for healing since ancient times
Evi-49
dence dated to 2000 BCE in Mesopotamia shows that
50
gardening activities have long been used for sensory
51
modulation [9] The beneficial effects of gardening on
52
veterans from World War I have also been noted [10]
53
Although previous researchers have tried to explore
54
the effects of the gardening setting on CVA survivors
55
[9, 11, 12], these studies have mostly focused on
56
a single or just a few cases, providing exploratory
57
results of variable effects There is still a need for
58
evidence-based research into the effects of
therapeu-59
tic gardening quantitatively [8] Furthermore, several
60
preliminary studies of the gardening setting have
61
reported positive therapeutic effects, including pain
62
relief [13], improvement in attention [14–16], stress
63
management [17], agitation reduction [18], and fall
64
prevention [19] The above positive effects are vital in
65
the further improvement of QoL [8] However,
insuf-66
ficient evidence remains about the beneficial effects
67
of gardening activities for people who have sustained
68
a CVA
69
Several studies have demonstrated gender
dispar-70
ities in stroke recovery [20–24] In an investigation
71
of retrospective cohort data, Boehme and Siegler [20]
72
found poorer functional outcomes for female patients
73
with stroke than for their male counterparts
Addi-74
tionally, using the Barthel Index [25] and Rankin
75
Scale [26], Di Carlo and Lamassa [23] collected data
76
across 7 countries, including England, France,
Ger-77
many, Hungary, Italy, Portugal, and Spain, and found
78
a significant gender effect on activities of daily living
79
(ADL) and handicap predictors of people with stroke
80
In that study, male gender was still shown as a
bet-81
ter predictor of functional recovery A similar effect
82
was indicated in a two-year follow-up study
employ-83
ing Health-Related Quality of Life (HRQoL) Sturm
84
and Donnan [24] indicated that female gender was a
85
determiner for lower quality of life than male gender
86
Das [27] found the gender differences on ergonomic
87
risk factors among farmers Therefore, there might
88
be some gender differences on musculoskeletal
influ-89
ences for people performing gardening activities
90
Understanding gender differences in recovery from
91
CVA with various gardening programs may provide
92
practitioners with guidelines for designing
appropri-ate gardening activities for each gender Although 94 some evidence strongly supports the gender dispar- 95 ity in stroke functional progress and QoL, no studies 96
to date have described the gender differences in QoL 97 improvement related to gardening with this disability 98
Besides gender differences, issues such as sever- 100 ity and time after stroke onset, may also affect the 101 functional recovery of people with stroke In a recent 102 study using a modified Rankin Scale as a measure of 103 functional performance, Liou and Lin [28] found that 104 rather than stroke severity, onset time was the more 105 significant indicator of functional status for people 106 who have sustained a CVA Regarding the association 107 between time after stroke onset and the future recov- 108 ery, Skilbeck, Wade [29] found that although most 109 recovery took place within 6 months in areas of basic 110 activities of daily living, arm function, and language, 111 there were still some non-significant improvement 112
in speech and language after 18 months rehabilita- 113 tion in their stroke unit Hochstenbach, den Otter 114 [30] also mentioned the long-term improvement in 115 cognitive function still occurred up to 2 years after 116 stroke onset by some of their participants, and the 117 most obvious recovery was in the attention-related 118 domains In addition, G Broeks, Lankhorst [31] 119 found that although most improvement happened 120 within 16 weeks, some arm motor functional recov- 121 ery still took place after 4 years after stroke onset 122
No studies were found in the current review of the 123 literature exploring the influence of onset time on the 124 quality of life of patients after therapeutic gardening 125
Other authors have discussed the benefits of 127 gardening in rehabilitation in general for patients 128 [32–34] Through the therapeutic use of gardening 129
as a form of occupation [32, 33], therapists consider 130 the benefits in the process of nurturing the plants, 131
to select the horticultural activities, which meet the 132 special needs of the participants [34] The horticul- 133 tural activities may include sowing seeds, tending 134 seedlings, adding water, pulling weed, and harvesting 135 plants finally Participants are benefited through the 136 active involvement of nurturing the living plants [34] 137
It should also be noted that different kinds of plants, 138 such as plants with different life cycles and charac- 139 teristics, may have different effects on patients The 140 plant life cycle usually starts from a seed, and the 141 seed will sprout to become an immature seedling 142 The seedling will grow continuously to be a mature 143 plant Then, the mature plant will grow flowers After 144 pollination, the fertilization allows flowers to develop
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seeds to restart a new life cycle of the plant The
dura-146
tion of the entire life cycle may vary from several
147
weeks to years depending on different types of plants
148
Therefore, tending for plants with different duration
149
of life cycles might bring about different physical and
150
also psychological influences to people For
exam-151
ple, participants tending plants with shorter life cycle
152
will harvest and get the feedbacks of collecting fruit
153
earlier than tending plants with longer life cycle It
154
is still unclear whether tending plants with different
155
duration of life cycle would have the same effects on
156
participants
157
1.2 Objective and Hypotheses
158
This study explored the effects of gardening on the
159
quality of life of patients with cerebral vascular
acci-160
dents The effects of plants with different duration of
161
life cycles on patients’ QoL were analyzed In this
162
research, long-term plants were plants with life cycle
163
longer than 3 months (tomato and string bean were
164
adopted in this design) Short-term plants were life
165
cycle shorter than 3 months (water spinach and lettuce
166
were adopted in this design) In addition, the amount
167
of variance in the beneficial gardening effects on
gen-168
der and the time after stroke onset was also examined
169
Based on the previous findings, although the
major-170
ity of recovery took place within 4 to 6 months after
171
stroke onset for acute patients, there was still some
172
speech recovery after 18 months [29], and arm motor
173
improvement after 4 years for chronic patients [31]
174
In this research, the chronic patients who had
sus-175
tained a CVA over 6 months were recruited to have a
176
stable condition to perform the gardening activities
177
Therefore, 18 months after stroke onset was chosen
178
as the cut point to classify the participants into two
179
groups: stage 1 (6 to 18 months after stroke onset)
180
and stage 2 (>18 months after stroke onset)
181
The study was developed to test three major
182
hypotheses
183
1) After gardening activities, males who have
sus-184
tained a CVA will demonstrate greater
improve-185
ment in their quality of life than females
186
2) After gardening activities, people in the CVA
187
stage 1 of recovery will demonstrate greater
188
improvement in their quality of life than people
189
in the CVA stage 2 of recovery
190
3) Tending plants with short-term life cycles will
191
have greater impact on quality of life than
tend-192
ing plants with long-term life cycles
193
Several pilot studies [9, 17] have supported the 194 effects of gardening for patients with stroke and 195 related diseases However, those preliminary stud- 196 ies lacked well-designed experiments and sufficiently 197 representative sampling Due to the limited scientific 198 evidence of the effects of gardening on people with 199 stroke, we explored these effects on 8 combinations 200 (2 levels of gender X 2 levels of stroke stage X 2 201 levels of plants) with 3 replications and analyzed 202 the results following the principles of experimental 203 design [35] No exploratory pilot test was run in this 204
This research explored how three factors (plant, 208 gender, and stroke stage) would influence improve- 209 ment in the quality of life of patients who have 210 sustained a CVA following their participation in a 211 gardening program The 2k factorial design, where 212
k equals 3, was applied to test the hypotheses in 213 this research Two kinds of plants, those with short- 214 term life cycles (short-term plants) and long-term 215 life cycles (long-term plants), were used Males and 216 females in stage1 and stage 2 of recovery from CVA 217
Before this research started, the leader of 220 this research project contacted with the clinical 221 occupational therapists in the Taipei Medical 222 University-Shuang Ho Hospital, Ministry of Health 223 and Welfare The major purpose of this project 224 was told to the occupational therapists, and they 225 were asked to consider appropriate participants who 226 met the inclusion criteria from their clients at that 227 time The inclusion criteria were (1) diagnosis of 228 CVA by a medical specialist, including ischemia 229 and hemorrhage, and onset time over 6 months; (2) 230 ability to communicate normally and clearly express 231 feelings; (3) no other injuries, musculoskeletal dis- 232 orders, or mental illness which could interfere with 233 participating in gardening activities; (4) agreement 234
to sign a participant consent form Then, the leader 235
of this research project invited the participants from 236 the list given by the occupational therapists, to join 237 the research After knowing all the risks/benefits 238 after joining this project and the right of dropping out
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this experiment at any time, all invited people agreed
240
to join and signed the participant consent form
241
Thirteen participants meeting the inclusion
cri-242
teria were invited to join this research Initially, it
243
was aimed as within subject design, that was each
244
participant must complete both treatment (tending
245
long-term plant and short-term plant) Finally, there
246
were 6 participants completed both treatment Five
247
participants joined only in the short-term plant
treat-248
ment, and two joined only long-term plant treatment
249
During the study, the participants dropped out due
250
to either decreased physical condition (expressed
251
too tired to perform outdoor activities) or stopped
252
insurance benefits Thus, for the short-term plant
253
treatment, there were 11 data points For the
long-254
term plant treatment, there were 8 data points
255
Eventually, the data collected were analyzed using
256
imbalanced factorial design
257
2.3 Dependent variable
258
The response variable in this study was
improve-259
ment in quality of life Quality of life was measured
260
with the Chinese version of the Stroke Specific
Qual-261
ity of Life scale (SSQOL), which had been previously
262
translated following standard translation procedures
263
[36] and validated by Hsueh and Jeng [37] in
Tai-264
wan The SSQOL is an evaluation tool developed
265
for patients with cerebral vascular accident (CVA) It
266
consists of 49 items that focus on 12 areas of
health-267
related quality of life The items are scored on a
268
5-point Likert-type scale; the higher the score the
bet-269
ter the quality of life The reliability and validity of the
270
SSQOL for various kinds of people with stroke have
271
been reported previously [38] The reliability and
272
validity of the Danish version of the SSQOL has been
273
examined in patients with intracerebral hemorrhage
274
[39] Ewert and Stucki [40] also validated the German
275
version of the SSQOL for patients with hemorrhagic
276
and ischemic stroke, and Boosman and Passier [41]
277
validated the scale for patients with aneurysmal
sub-278
arachnoid hemorrhage Measures of reliability and
279
validity were found to be acceptable
280
2.4 Independent variables
281
The three controlled variables were gender, life
282
cycle of plants, and time after stroke onset The
differ-283
ent effects on male and female patients were tested
284
The life cycles of plants consisted of two categories:
285
long-term (>3 months) and short-term (<3 months)
286
The time after stroke onset were classified into stage
1 (6–18 months after stroke onset) and stage 2 (>18 288
The factors that were held constant were the ther- 291 apist and the gardening environment The entire 292 gardening program was conducted by one registered 293 occupational therapist In addition, evaluation and 294 intervention were conducted in the same clinical set- 295
Each participant had their own speed of recovery, 298 and differences in this speed could possibly influence 299 the improvement in their quality of life Caregiver 300 attitudes and patient motivation could also affect 301 the rate of recovery The strategy we used was to 302 select cases with similar features We recruited cases 303 only from New Taipei City in an attempt to reduce 304 the impact of nuisance factors However, since peo- 305 ple from the same place might still show different 306 amounts of improvement, once the variables of gen- 307 der and CVA level were confirmed, participants were 308 randomly assigned to either tending long-term plants 309
or tending short-term plants After three months, the 310 treatment exchanged People who tended long-term 311 plants changed to tend short-term plants, and vice 312
Before the data collection, the experimental proto- 315 col and participant consent procedure were approved 316
by the Taipei Medical University-Joint Institutional 317 Review Board (case No 201204015) The written 318 informed consent, in accordance with institutional 319 guidelines, was completed by each participant before 320
All participants attended the gardening program 323 once a week, for one hour in each session Par- 324 ticipants were guided to tend different plants by a 325 registered occupational therapist in a garden located 326 within Taipei Medical University-Shuang Ho Hospi- 327 tal, Ministry of Health and Welfare For the long-term 328 plant condition, participants tended tomato and string 329 beans, which were not harvested by the end of the gar- 330 dening program Participants in the short-term plant
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condition tended water spinach and lettuce At the end
332
of the gardening program, all short-term plants were
333
harvested by the patients themselves For each plant
334
condition, the duration of the gardening program was
335
3 months
336
Quality of life was evaluated before and after the
337
gardening program by two registered occupational
338
therapists These two therapists were familiar with
339
the instruments and used the same scoring
guide-340
lines In addition, they were blind to the research
341
hypotheses Twelve areas were evaluated including:
342
energy level, family roles, language, mobility, mood,
343
personality, self-care, social roles, thinking, vision,
344
upper-extremity function and work productivity The
345
score for each area was obtained by summing the
346
scores on all items in each of these areas The total
347
quality of life score for each participant was obtained
348
by summing the results from the 12 areas to obtain a
349
health-related quality of life score
350
2.9 Data analysis
351
The response was defined as the change in score on
352
quality of life between the before and after measures,
353
the higher the response the greater the improvement
354
Thus, a total of 13 responses, including score changes
355
in 12 areas and one total score, were collected for each
356
participant Additionally, 3 factors, each at 2 levels,
357
were analyzed using the 23factorial design Minitab
358
(16thedition) was used as the statistical software For
359
gender, male was marked as 1 and female marked as
360
-1 For time after stroke onset, stage 1 was marked as
361
1 and stage 2 was marked as –1 For plant life cycle,
362
long-term life cycle was marked as –1 and short-term
363
life cycle was marked as 1 Due to the fact that some
364
participants could not complete all experimental
con-365
ditions, the data were analyzed using imbalanced 23
366
factorial design with replication (number of available
367
participants)
368
3 Results
369
The significant results of social role and family role
370
as determined by 23replicated factorial analyses are
371
presented as follows
372
3.1 Social role
373
According to the analysis for the 23 factorial
374
design, the Pareto chart (Fig 1), Normal plot (Fig 2),
375
and Half normal plot (Fig 3) showed significant
Fig 1 Pareto chart for social role Plant: factor A, Gender: factor
B, Time after stroke onset: factor C.
Fig 2 Normal plot for social role Plant: factor A, Gender: factor
B, Time after stroke onset: factor C.
effects of variable A (plant) (F = 8.22, p = 0.015) and 377
AB interaction (plant and gender) (F = 8.8, p = 0.013) 378
on improvement of the social role area Based on 379 further analysis of the main effect (Fig 4), partici- 380 pants tending short-term plants demonstrated greater 381 improvement in the social role area than those who 382 tended long-term plants The interaction plot (Fig 5) 383 showed that females demonstrated more improve- 384 ment than males when tending short-term plants 385 Based on the cube plot (Fig 6), the optimal level 386 combination of the social role response was found 387
in female participants in the stage 2 tending short- 388 term plants Based on the correlation coefficients in 389 Table 1, the regression function is as follows: 390
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Fig 3 Half normal plot for social role Plant: factor A, Gender:
factor B, Time after stroke onset: factor C.
Fig 4 Main effects plot for social role Plant: factor A (1,
short-term; –1, long-term), gender: factor B (1, male; –1, female), time
after stroke onset: factor C (1, stage 1; –1, stage 2).
Fig 5 Interaction plot for social role Plant: factor A (1,
short-term; –1, long-term), gender: factor B (1, male; –1, female), time
after stroke onset: factor C (1, stage 1; –1, stage 2).
Fig 6 The design for the social role area shown geometrically in the cube plot Optimal level combination appeared on plant (1), gender (–1), and onset time (–1).
Table 1 The estimated effects and coefficients for the social role area
ˆy = 0.0167 + 0.7167x 1+ 0.3083x 2+ 0.2833x 3 391
+ (–0.7417)x 1 x 2 + (–0.1167)x 1 x 3 + (–0.0250) 392
x 2 x 3+ 0.225 x 1 x 2 x 3 r 2 = 0.5781 393
where ˆy is the predicted quality of life improve- 394
ment, x 1is the variable representing factor A (plant), 395
x 2is the variable representing factor B (gender), and 396
x 3 is the variable representing factor C (time after 397
stroke onset) The x 1 x 2 , x 1 x 3 , and x 2 x 3 represent 398 the two-way interactions The three-way interaction 399
is represented by x 1 x 2 x 3 In this fitted regression 400
model, x 1 , x 2 , and x 3 were all defined on a coded 401
According to the analysis with the 23 factorial 404 design, the significant effects of variable AB inter- 405
action (plant and gender) (F = 13.57, p = 0.004) and 406
AC interaction (plant and time after stroke onset) 407
(F = 6.08, p = 0.031) on improvement in the fam- 408 ily role area were revealed in the Pareto chart 409 (Fig 7), Normal plot (Fig 8), and Half normal plot
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Fig 7 Pareto chart for family role Plant: factor A, Gender: factor
B, Time after stroke onset: factor C.
Fig 8 Normal plot for family role Plant: factor A, Gender: factor
B, Time after stroke onset: factor C.
(Fig 9) The main effects of three factors are shown
411
in Fig 10 The interaction plot (Fig 11) showed
412
that males demonstrated greater improvement than
413
females while tending long-term plants
Addition-414
ally, patients in the stage 1 tending long-term plants
415
demonstrated greater improvement than those in the
416
stage 2 The cube plot for the design of family roles
417
in Fig 12 revealed that the optimal level
combina-418
tion of family role area appeared in two situations:
419
female patients in the stage 2 tending short-term pants
420
and male patients in the stage 1 tending long-term
421
plants Based on the correlation coefficients shown
422
in Table 2, the regression function was as follows:
423
ˆy = (–0.1208) + (–0.0708)x 1 + (–0.0542)x 2
424
+ (–0.0375)x 3 + (–0.5042)x 1 x 2 + (–0.3375)x 1 x 3
425
+ (–0.2208) x 2 x 3 + (–0.0208) x 1 x 2 x 3 r 2 = 0.6966
426
Fig 9 Half normal plot for family role Plant: factor A, Gender: factor B, Time after stroke onset: factor C.
Fig 10 Main effects plot for family role Plant: factor A (1, short-term; –1, long-term), gender: factor B (1, male; –1, female), time after stroke onset: factor C (1, stage 1; –1, stage 2).
where ˆy is the predicted quality of life improvement, 427
x 1 is the variable representing factor A (plant), x 2 428
is the variable representing factor B (gender), and 429
x 3 is the variable representing factor C (time after 430
stroke) In this fitted regression model, x 1 x 2 rep- 431
resents the interactions between x 1 and x 2 , x 1 x 3 432
represents the interaction between x 1 and x 3 , and 433
x 2 x 3 represents the two-way interaction between 434
x 2 and x 3 The three-way interaction is repre- 435
sented by x 1 x 2 x 3 The variables of x 1 , x 2, and 436
x 3 were all defined on a coded scale from –1 437
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Fig 11 Interaction plot for family role Plant: factor A (1,
short-term; –1, long-term), gender: factor B (1, male; –1, female), time
after stroke onset: factor C (1, stage 1; –1, stage 2).
Fig 12 The design for family role shown geometrically in the
cube plot Optimal level combination appeared in two situations:
plant (1), gender (–1), onset time (–1), plant (–1), gender (1), onset
time (1)
4 Discussion
439
4.1 Social role
440
Significant effects of plant type and gender/plant
441
interaction were found for improvement in quality
442
of life under social role For all participants, the
443
care of short-term plants was linked to improved
444
social role This difference between short and long
445
term plant care could be due to the shorter harvest
446
period of short-term plants However, when gender
447
was considered simultaneously, females showed
bet-448
ter responses than males to short-term plants In our
449
observation, the short-term plants (water spinach and
Table 2 The estimated effects and coefficients for the family role area
plantXgenderXstroke –0.0417 –0.0208 0.1369 –0.15 0.882
lettuce) were harvested by the participants at the end 451
of the gardening program This harvest could provide 452 participants with a chance to share the vegetables with 453 friends and thereby enhance their social interactions 454 However, it still needs further investigation to explore 455 the reason of gender differences on the improvement 456
The significant interaction of plant and gender 459 using the 2kreplicated factorial design showed that 460 while tending long-term plants, males tended to show 461 greater improvement in the family role than females 462 This might be explained by the features of tomatoes 463 and string beans, the long-term plants adopted in this 464 research Although at the end of the gardening pro- 465 gram, these two plants had not been harvested, fruit 466 had begun growing on the stems It is possible that 467 the tomatoes and string beans were more likely to 468 give people obvious visual feedback stimuli than the 469 short-term plants (water spinach and lettuce) Rosen- 470 blitt and Soler [42] observed more sensation seeking 471 behavior, especially for visual sensation, in men than 472
in women Therefore, we speculated that the obvious 473 appearance of fruit could give male participants more 474 confidence that they could be productive gardeners 475 and be less of a burden on their families 476 The significant interaction of plant and time after 477 stroke onset showed that when tending long-term 478 plants, participants in the CVA stage 1 tended to show 479 greater improvement in their quality of life scores 480 than those in the stage 2 As reported in several previ- 481 ous studies, acute stage CVA patients are more likely 482
to suffer feelings of depression than chronic stage 483 patients [43–45] due to the sudden impact of stroke 484
on their lives The feelings of depression may cause 485 acute patients to see themselves as a burden on their 486 families In this study, after tending long-term plants, 487 participants with stroke less than 18 months showed 488 that their perception of family burden decreased more
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significantly than people sustained a CVA over 18
490
months Based on our findings, the visually obvious
491
fruit, tomatoes and string beans, may increase the
492
confidence of participants and improve their quality
493
of life in the family role area
494
4.3 Limitations
495
In interpreting the findings, it is important to
con-496
sider the following limitations:
497
1) Baseline condition:
498
Each participant had a different baseline
condi-499
tion, which may have resulted in different speeds
500
of improvement However, it is hard to control the
501
baseline condition Therefore, we measured the
dif-502
ference between the pre-test and the post-test to
503
reflect improvement from the onset to the end of
504
gardening program for each participant
505
2) Natural disease progression:
506
The variables we measured may have been affected
507
by the variation of natural disease progression,
partic-508
ularly in the areas of physical, mental, and functional
509
performance, which could cause variation in
qual-510
ity of life improvement Using a large number of
511
participants may reduce the effect of natural disease
512
progression, because it is unlikely that all participants
513
develop this progression during measurement period
514
Due to the availability of participants qualifying the
515
selection criteria of the study, the study results were
516
obtained based on a relatively small number of
par-517
ticipants It is recommended to increase the number
518
of participants in the future
519
3) Limits to randomization:
520
Once a case was selected, the variables of gender
521
and disease severity were defined The only variable
522
we could select for this case was the plant life cycle
523
Randomly arranging the participants into different
524
groups tending long-term and short-term plants could
525
further reduce the errors However, the ideal
condi-526
tion should be the full randomization of all factors
527
5 Conclusion
528
This research provides further evidence for the use
529
of gardening programs with people who are
recover-530
ing from CVA Higher levels of quality of life were
531
shown by female participants sustained a CVA over
532
18 months tended short-term plants (see cube plot
in Fig 12) Additionally, the optimal level of social 534 role improvement was seen in female participants 535 sustained a CVA over 18 months tending short-term 536 plants It should be noticed that the effects of plant 537 features and gender-related differences enhanced the 538 social role of participants in this sample In addition, 539 based on our analysis, in the future to improve the 540 quality of life for people with CVA, especially in the 541 family role, practitioners are recommended to con- 542 sider plant features, gender differences, and the time 543 after CVA onset when arranging gardening programs 544 Although sample size in this research was small, 545 significant results were obtained This study shows 546 that tending different types of plants resulted in 547 significant differences in the beneficial effects of 548 gardening on quality of life for people with CVA 549 Gender-related differences and the time after CVA 550 onset need to be taken into consideration in future 551 studies Based on this finding, we think that further 552 experiments examining factors related to partici- 553 pants’ preferences would be useful in identifying 554 the key factors in motivation enhancement It is also 555 suggested that future studies employ longer periods 556
of gardening to further examine whether the visual 557 effect of the appearance of fruit is significant There 558 are factors in the gardening process that can influ- 559 ence the quality of life of people who have sustained a 560 CVA The current findings provide future researchers 561 with directions for further investigation in this area 562
The funding was supported by Shuang Ho Hos- 564 pital, Taipei Medical University The number of this 565 research project is 101SHH-HCP-04 566
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