Validity, reliability and Norwegian adaptation of the Stroke-Specific Quality of Life (SS-QOL) scale

Feasibility of a 10-week community-based mobile health rehabilitation program using the WalkWithMe application in late sub-acute and chronic stroke survivors in a low resource setting: A pilot study

 Physical functioning can be increased in people with stroke by using a mobile health application. This study aimed to investigate the feasibility of a 10-week community-based program using the WalkWithMe (WWM) application in people with late sub-acute and chronic stroke in Benin. An interventional pilot study with mixed methods research design was used examining the application of an unsupervised individualized mobile Health (mHealth) instructed training program. Main outcome included the application usage, safety, adherence, perceived enjoyment, mHealth quality, patient experiences and pre-post efficacy measures. Nine adults, five males, median age of 60 years and time since stroke of 12 months participated in this study. For most participants adherence with the application was over 70%. However, some usability problems were observed due to incorrect understanding and use by participants and technical problems. The application was very fun, stimulating and enjoyable. Significant improvements were found with median (pre/post measures) of locomotors skill (1.4/3.4); impairments (38/40), Barthel Index (85/95), activity limitation (2.1/3.1), and quality of life (194/218). A trend towards significant improvement was found with 6 minutes walking test (181/220, p = 0.06). The WWM application is perceived as a potential approach to increase physical activity and functioning among people with stroke in Benin.

Tools for Assessing Quality of Life in People with Stroke-Induced Aphasia: A Literature Review

BACKGROUND

The quality of life (QOL) of individuals with stroke-induced aphasia is significantly impacted by the condition. Clinicians and researchers are increasingly focusing on QOL assessments for people with aphasia (PWA) to gauge the effects of aphasia and the effectiveness of interventions. While several QOL assessment tools are utilized for PWA, there is limited literature comparing and evaluating their suitability for this population. This review aimed to explore the QOL measurement tools used with PWA, their aphasia-friendly characteristics, their applicability to severe aphasia, and the technical aspects of these questionnaires.

SUMMARY

The review process involved two stages. Initially, a search was conducted to identify the tools used for assessing the QOL of PWA in studies published between 1975 and 2022. Various databases such as Google Scholar, PubMed, Scopus, and Web of Science were searched using specific keywords related to stroke, aphasia, QOL, questionnaires, outcome measurements, tools, scales, and instruments. Subsequently, hand searching was employed to gather additional information on the identified tools, including technical properties, communication and language domains, and crucial factors for QOL assessment in PWA. Results revealed that 28 articles met the inclusion criteria, identifying 26 tools for QOL assessment in PWA, comprising 11 generic, 9 stroke-specific, and 6 aphasia-specific tools. Technical details such as research country distribution, publication years (ranging from 1972 to 2015), completion time, administration methods (self-reporting), item formats (question or statement), response types (all tools, except SIP-136, NHP, and SA-SIP30 used Likert type scale for ratings), scoring methods (sum of score or using an algorithm), translation/adaptation status (EQ-5D-3L among generic tools, SIS-16 among stroke-specific questionnaires, and SAQOL-39 among aphasia-specific instruments received the most amount of translation/adaptation), respondent characteristics (almost all the tools except aphasia-specific tests excluded people with severe aphasia), number of dimensions (ranged 1-12), item numbers [6-136], and coverage of communication/language domains (BOSS, CDP, ALA, AIQ-21 covered all language domains) were analyzed. Notably, ALA emerged as the most suitable tool for assessing QOL in PWA due to its alignment with the desired features.

KEY MESSAGES

Based on the review findings, clinicians and researchers are advised to prioritize the following features when selecting a QOL questionnaire for PWA: aphasia-specific and aphasia-friendly design, comprehensive coverage of QOL dimensions, inclusion of all language domains, and provision of self-reporting opportunities for PWA across all severity levels. ALA stands out as the preferred tool for QOL assessment in PWA based on its adherence to these criteria.

Change characteristics of health-related quality of life and its association with post-stroke fatigue at four-year follow-up

OBJECTIVE

To explore trajectories that describe change in post-stroke health-related quality of life with fatigue as outcome.

DESIGN

Observational and prospective study.

SUBJECTS

Stroke survivors (N = 144) with predominantly mild or moderate strokes.

METHODS

The multidimensional Stroke-Specific Quality of Life scale was used at 1 and 4 years, and the Fatigue Severity Scale at 4 years post-stroke. Latent class growth analyses were used as person-oriented analyses to identify meaningful trajectories. Socio-demographic and stroke-related covariables provided customary adjustment of the outcome, as well as prediction of class membership.

RESULTS

The latent class growth analysis models were estimated for "physical health", "visual-language", and "cognitive-social-mental" components of the Stroke-Specific Quality of Life scale, which extracted trajectories describing a variation in stable, deteriorating and improving functional patterns. The stable, well-functioning trajectory was most frequent across all components. More pronounced fatigue was associated with trajectories describing worse functioning, which was more prominent among females compared with males. Living alone implied more fatigue in the "cognitive-social-mental" component. Within the "visual-language" components' trajectories, younger and older participants reported more fatigue compared with middle-aged participants.

CONCLUSION

Most participants belonged to the stable, well-functioning trajectories, which showed a consistently lower level of fatigue compared with the other trajectories.

Cultural adaptation and validation of the Arabic version of the short 12-item stroke-specific quality of life scale

Background

Given the excessive length and inconsistent validity of the existing long stroke-specific quality of life (SS-QOL) scales, there is a need to validate a shorter measuring tool. The aim of this study was to validate the Arabic version of the short 12-item SS-QOL (SS-QOL-12-AR) and examine its validity measures and psychometric properties. Additionally, the study aimed to assess the QOL after stroke and identify the sociodemographic and clinical factors that influence it in Lebanon.

Methods

A cross-sectional study was conducted. The SS-QOL-12-AR structure was validated, and its reliability and internal consistency were assessed. The scale's specificity and sensitivity were evaluated and then compared with those of other SS-QOL scales. The correlation between each item and the overall scale were examined, and its convergent validity was evaluated.

Results

A total of 172 stroke survivors were included. The SS-QOL-12-AR structure was validated with a solution of two factors, with a Kaiser-Meyer-Olkin measure of sampling adequacy of 0.850 and a significant Bartlett's test of sphericity (p < 0.001). The Cronbach's alpha of the scale was 0.917. According to ROC curve analysis, the optimal cut-off point for distinguishing between lower and better QOL was 32.50. At this cut-off, the sensitivity and specificity were 70.0% and 71.2%, respectively. The area under the curve was 0.779 (95% CI 0.704-0.855, p < 0.001). The SS-QOL-12-AR demonstrated a strong and highly significant correlation with existing versions of the SS-QOL, confirming its convergent validity. 61.6% of stroke survivors had a lower QOL, which was significantly associated with poor stroke prognosis, increased physical dependence, current smoking, and alcohol abstinence.

Conclusion

The SS-QOL-12-AR exhibits strong validity and reliability, demonstrating excellent psychometric properties. The scale holds potential for application in clinical practice and research settings, enabling the measurement of stroke-related consequences and evaluation of management outcomes.

Translation and adaptation of the stroke-specific quality of life scale into Swahili

Background

Stroke care requires a patient-centred, evidence-based and culturally appropriate approach for better patient clinical outcomes. Quality of life necessitates precise measuring using health-related quality measures that are self-reported and language appropriate. However, most of the self-reported measures were devised in Europe and therefore not considered contextually appropriate in other settings, more so in Africa.

Objectives

Our study aimed to produce a Swahili version by translating and adapting the stroke-specific quality of life (SSQOL) scale among people with stroke in Kenya.

Method

We used a questionnaire translation and cross-cultural adaptation. The pre-validation sample of 36 adult participants was drawn from 40 registered people with stroke, from the Stroke Association of Kenya (SAoK). Quantitative data were collected using both English and Swahili versions of the SSQOL scale. The mean, standard deviation (s.d.) and overall scores were calculated and are presented in tables.

Results

The back translation revealed a few inconsistencies. Minor semantic and equivalence alterations were done in the vision, mood, self-care, upper extremity function and mobility domains by the expert review committee. Respondents indicated that all questions were well-understood and captured. The stroke onset mean age was 53.69 years and the standard deviation was 14.05.

Conclusion

The translated version of the Swahili SSQOL questionnaire is comprehensible and well-adapted to the Swahili-speaking population.

Clinical implication

The SSQOL has the potential to be a useful outcome measure for use in Swahili-speaking patients with stroke.

Neurological Health: Not Merely the Absence of Disease: Current Wellbeing Instruments Across the Spectrum of Neurology

OBJECTIVE

Well-being and quality of life can vary independently of disease. Instruments measuring well-being and quality of life are commonly used in neurology, but there has been little investigation into the extent in which they accurately measure wellbeing/quality of life or if they merely reflect a diseased state of an individual.

DESIGN

Systematic searches, thematic analysis and narrative synthesis were undertaken. Individual items from instruments represented in ≥ 5 publications were categorised independently, without prior training, by five neurologists and one well-being researcher, as relating to 'disease-effect' or 'Well-being' with a study-created instrument. Items were additionally categorised into well-being domains.

DATA SOURCES

MEDLINE, EMBASE, EMCARE and PsycINFO from 1990 to 2020 were performed, across the 13 most prevalent neurological diseases.

RESULTS

301 unique instruments were identified. Multiple sclerosis had most unique instruments at 92. SF-36 was used most, in 66 studies. 22 instruments appeared in ≥ 5 publications: 19/22 'well-being' outcome instruments predominantly measured disease effect (Fleiss kappa = .60). Only 1/22 instruments was categorised unanimously as relating to well-being. Instruments predominantly measured mental, physical and activity domains, over social or spiritual.

CONCLUSIONS

Most neurological well-being or quality-of-life instruments predominantly measure disease effect, rather than disease-independent well-being. Instruments differed widely in well-being domains examined.

Visual Problems are Associated with Long-Term Fatigue after Stroke

OBJECTIVE

Post-stroke fatigue may be associated with functioning even in patients with mild stroke. In order to guide rehabilitation, the aim of this study was to investigate the independent contribution of 12 function-related domains to severe long-term fatigue.

DESIGN

Observational follow-up study.

SUBJECTS

A total of 144 stroke survivors (mean age 67.3, standard deviation (SD) 10.9 years) were included.

METHODS

Fatigue 3-4 years post-stroke was measured with the Fatigue Severity Scale (cut-off ≥5). Independent variables were the multidimensional Stroke-Specific Quality of Life scale with 12 domains, demographics, and baseline stroke characteristics.

RESULTS

Most of the participants had mild and moderate stroke. Thirty-five percent (n = 51) reported severe fatigue 3-4 years after stroke. Those living with a significant other, and working participants reported significantly less fatigue. All domains of the Stroke-specific Quality of Life scale were significantly associated with the Fatigue Severity Scale. Adjusted for age, sex, marital status, and work status, the domains "energy", "mood", and, unexpectedly, the domain "vision", were all variables independently associated with severe long-term fatigue.

CONCLUSION

Stroke survivors with prominent self-reported visual problems were more likely to experience fatigue. This finding should be verified in further studies. Visual examination and visual rehabilitation may reduce fatigue in selected stroke survivors.

Cross-cultural translation, adaptation, and validation of the stroke-specific quality of life (SSQOL) scale 2.0 into Amharic language

BACKGROUND

The stroke-specific quality of life 2.0 (SSQOL 2.0) scale is a valid, reliable instrument which has been widely used as a patients reported outcome measure among stroke survivors. However, the SSQOL scale has not been validated and used in any Ethiopian language. This study aimed to translate, culturally adapt, and test the psychometric properties of the SSQOL scale 2.0 in Amharic, which is the official and working language with about 34 million (23%) speakers in Ethiopia.

METHODS

The adapted English version of the SSQOL 2.0 scale was translated into Amharic and then back-translated to English. An expert committee translated and created a final Amharic version of SSQOL (SSQOL-AM) scale. Pre-field testing (pilot and cognitive debriefing) was conducted with 15 post-stroke subjects. The SSQOL-Am was administered to 245 stroke survivors from four referral hospitals to determine the psychometric properties. Cronbach's alpha and Intra-class correlation coefficient were used to calculate the internal consistency and test-retest reliability, spearman's correlation for the convergent validity of the SSQOL-Am scale. The Standard Error of Measurement (SEM), Minimum Detectable Change (MDC), Bland Altman Limit of Agreement (LOA), Confirmatory Factor Analysis, and Exploratory Factor Analysis were also determined.

RESULTS

The SSQOL-Am demonstrated excellent test-retest reliability (ICC = 0.93), internal consistency (Cronbach's alpha = 0.96), SEM 0.857, MDC 1.94, and good LOA. As postulated, the mobility domain of the tool demonstrated a significantly strong correlation with the physical function domain of the SF-36 (rho = 0.70, p < 0.001).

CONCLUSIONS

The SSQOL-Am is a valid and reliable outcome measure. The tool can be used in both clinical practice and research purposes with Amharic speaking post-stroke survivors.

Investigation of Factors That Affect the Quality of Life After a Stroke

Stroke, as a disease, describes a group of disorders characterized by the presence of central nervous system symptoms either as a result of ischemia (ischemic stroke) or bleeding (hemorrhagic stroke). The appearance of a stroke results in a permanent physical or cognitive disability. The stroke incidence is the third cause of death after heart disease and cancer, and is the main cause of long-term disability.The effects of a stroke on a patient's daily life, and hence on his quality of life, are intense and long-lasting. These include memory problems, speech difficulty, depression, reduced vision loss, and decreased walking ability. This limitation of the patient's motor activity has a direct negative impact on the quality of his life.To investigate the degree of this impact, a research was carried out at a hospital of Central Greece. The total sample consisted of 90 patients and the responses showed that post-stroke symptoms are significant. Consequences and treatment control of the disease on the life of the sample were the questions with the highest score showing the significant effect that a stroke has on life the patients.More specifically, the sample showed through responses that the disease affects their lives to a great extent. The pre-stroke scores on the domains of the sample are clearly higher than post-stroke. The highest difference was found in the use of the upper extremities in self-care and family roles while the lowest was found in the domain of thinking. The most affected domains were as follows: thinking, vision, and language. Alternatively, the least affected domain was family roles.

Construction and Validation of the 17-Item Stroke-Specific Quality of Life Scale (SS-QOL-17): A Comprehensive Short Scale to Assess the Functional, Psychosocial, and Therapeutic Factors of QOL among Stroke Survivors

(1) Background: The exiting stroke-specific quality of life (SS-QOL) measure scales are limited by their excessive length, inconsistent validity, and restricted breadths of assessment. The objectives of this study were to construct and validate a comprehensive short SS-QOL scale to assess stroke-related outcomes and QOL and determine the socioeconomic, sociodemographic, and pharmacotherapeutic predictors of QOL among stroke survivors. (2) Methods: The novel 17-item SS-QOL scale (SS-QOL-17) was constructed with the aim of providing a well-balanced measuring tool to depict QOL widely while ensuring the simplicity of administration. (3) Results: The SS-QOL-17 structure was validated over a solution of three factors with a Kaiser-Meyer-Olkin measure of sampling adequacy = 0.894 and a significant Bartlett's test of sphericity (p < 0.001). The Cronbach's alpha of the SS-QOL-17 was 0.903. Better QOL was correlated to financial wellbeing (beta 0.093, p < 0.001), and medication adherence (beta 0.305, p = 0.004), whereas reduced QOL was correlated to older age (beta -0.117, p = 0.014), illiteracy (beta -6.428, p < 0.001), unemployment (beta -6.170, p < 0.001), and higher amount of prescribed medication (beta -1.148, p < 0.001). (4) Conclusions: The SS-QOL-17 is a valid and reliable tool with promising psychometric properties. It is useful in clinical practice and research settings to evaluate the post-stroke therapeutic and rehabilitation outcomes.

Effect of innovative vs. usual care physical therapy in subacute rehabilitation after stroke. A multicenter randomized controlled trial

Background

Research on stroke rehabilitation often addresses common difficulties such as gait, balance or physical activity separately, a fragmentation contrasting the complexity in clinical practice. Interventions aiming for recovery are needed. The purpose of this study was to investigate effects of a comprehensive low-cost physical therapy intervention, I-CoreDIST, vs. usual care on postural control, balance, physical activity, gait and health related quality of life during the first 12 weeks post-stroke.

Methods

This prospective, assessor-masked randomized controlled trial included 60 participants from two stroke units in Norway. Participants, who were randomized to I-CoreDIST (n = 29) or usual care physical therapy (n = 31), received 5 sessions/week when in-patients or 3 sessions/week as out-patients. Primary outcomes were the Trunk Impairment Scale-modified Norwegian version (TISmodNV) and activity monitoring (ActiGraphsWgt3X-BT). Secondary outcomes were the Postural Assessment Scale for Stroke, MiniBesTEST, 10-meter walk test, 2-minute walk test, force-platform measurements and EQ5D-3L. Stroke specific quality of life scale was administered at 12 weeks. Linear regression and non-parametric tests were used for statistical analysis.

Results

Five participants were excluded and seven lost to follow-up, leaving 48 participants in the intention-to-treat analysis. There were no significant between-group effects for primary outcomes: TIS-modNV (p = 0,857); daily average minutes of sedative (p = 0.662), light (p = 0.544) or moderate activity (p = 0.239) and steps (p = 0.288), or secondary outcomes at 12 weeks except for significant improvements on EQ5D-3L in the usual care group. Within-group changes were significant for all outcomes in both groups except for activity levels that were low, EQ5D-3L favoring the usual care group, and force-platform data favoring the intervention group.

Conclusions

Physical therapy treatment with I-CoreDIST improved postural control, balance, physical activity and gait during the first 12 weeks after a stroke but is not superior to usual care.

Self-reported quality of life following stroke: a systematic review of instruments with a focus on their psychometric properties

PURPOSE

To evaluate the psychometric properties of common health-related quality-of-life instruments used post stroke and provide recommendations for research and clinical use with this diagnostic group.

METHODS

A systematic review of the psychometric properties of the five most commonly used quality-of-life measurement tools (EQ-5D, SF-36, SF-6D, AQoL, SS-QOL) was conducted. Electronic searches were performed in MEDLINE, CINAHL, and EMBASE on November 27th 2019. Two authors screened papers against the inclusion criteria and where consensus was not reached, a third author was consulted. Included papers were appraised using the COnsensus-based Standards for the selection of health status Measurement INstruments (COSMIN) checklist and findings synthesized to make recommendations.

RESULTS

A total of n = 50,908 papers were screened and n = 45 papers reporting on 40 separate evaluations of psychometric properties met inclusion criteria (EQ-5D = 19, SF-36 = 16, SF-6D = 4, AQoL = 2, SS-QOL = 4). Studies reported varied psychometric quality of instruments, and results show that psychometric properties of quality-of-life instruments for the stroke population have not been well established. The strongest evidence was identified for the use of the EQ-5D as a quality-of-life assessment for adult stroke survivors.

CONCLUSIONS

This systematic evaluation of the psychometric properties of self-reported quality-of-life instruments used with adults after stroke suggests that validity across tools should not be assumed. Clinicians and researchers alike may use findings to help identify the most valid and reliable measurement instrument for understanding the impact of stroke on patient-reported quality of life.

Effects of early rehabilitation nursing on neurological functions and quality of life of patients with ischemic stroke hemiplegia

OBJECTIVE

This study aimed at exploring the effects of early rehabilitation nursing (ERN) on the neurological functions, the incidence of lower extremity deep venous thrombosis (LEDVT) and the quality of life (QOL) of patients with ischemic stroke hemiplegia (ISH).

METHODS

Admitted to our hospital from January 2018 to February 2019, 123 patients with ISH were enrolled, among which 70 cases received routine nursing (a control group) and 53 cases received ERN (a study group). The patients in the two groups were compared with respect to the scores of the European Stroke Scale (ESS), the Barthel Index (BI) and the Fugl-Meyer Assessment (FMA), the incidences of complications and LEDVT, QOL and nursing satisfaction.

RESULTS

After intervention, the ESS, BI and FMA scores rose in both groups, but they were remarkably higher in the study group (P < 0.05). Compared with those in the control group, patients in the study group had remarkably lower incidences of complications and LEDVT (P < 0.05), remarkably better indicators of QOL (P < 0.05), and higher nursing satisfaction (P < 0.05).

CONCLUSION

For patients with ISH, ERN can improve neurological functions, reduce the incidence of LEDVT, and improve their QOL, so this safe and effective nursing method is worthy of clinical application.

Stroke-Specific Quality of Life one-year post-stroke in two Scandinavian country-regions with different organisation of rehabilitation services: a prospective study

Purpose: To compare stroke-specific health related quality of life in two country-regions with organisational differences in subacute rehabilitation services, and to reveal whether organisational factors or individual factors impact outcome.Materials and methods: A prospective multicentre study with one-year follow-up of 369 first-ever stroke survivors with ischaemic or haemorrhagic stroke, recruited from stroke units in North Norway (n = 208) and Central Denmark (n = 161). The 12-domain Stroke-Specific Quality of Life scale was the primary outcome-measure.Results: The Norwegian participants were older than the Danish (M_age= 69.8 vs. 66.7 years, respectively), had higher initial stroke severity, and longer stroke unit stays. Both cohorts reported more problems with cognitive, social, and emotional functioning compared to physical functioning. Two scale components were revealed. Between-country differences in the cognitive-social-mental component showed slightly better function in the Norwegian participants. Depression, anxiety, pre-stroke dependency, initial stroke severity, and older age were substantially associated to scale scores.Conclusions: Successful improvements in one-year functioning in both country-regions may result from optimising long-term rehabilitation services to address cognitive, emotional, and social functioning. Stroke-Specific Quality of Life one-year post-stroke could be explained by individual factors, such as pre-stroke dependency and mental health, rather than differences in the organisation of subacute rehabilitation services.IMPLICATIONS FOR REHABILITATIONThe stroke-specific health related quality of life (SS-QOL) assessment tool captures multidimensional effects of a stroke from the perspective of the patient, which is clinically important information for the rehabilitation services.The cognitive-social-mental component and the physical health component, indicate specific functional problems which may vary across and within countries and regions with different organisation of rehabilitation services.For persons with mild to moderate stroke, longer-term functional improvements may be better optimised if the rehabilitation services particularly address cognitive, emotional, and social functioning.

Can the health related quality of life measure QOLIBRI- overall scale (OS) be of use after stroke? A validation study

BACKGROUND

Brief measures of health-related quality of life (HRQOL) that assess both patient-reported functioning and well-being after stroke are scarce. The objective of this study was to examine reliability and validity of one of these measures, the patient-reported Quality of Life after Brain Injury-Overall Scale (QOLIBRI-OS), in patients after stroke.

METHODS

Stroke survivors were examined prospectively using survey methods. Core survey data (n = 125) and retest data (n = 36) were obtained at 3 and 12 months, respectively. Item properties (distribution, floor and ceiling effects), psychometric properties (reliability and model fit), and validity (correlations with established measures of anxiety, depression and HRQOL) of the QOLIBRI-OS were examined.

RESULTS

Missing responses on the questionnaire were low (0.5%). All items were positively skewed. No floor effects were present, whereas five out of six items showed ceiling effects. The summary QOLIBRI-OS score exhibited no floor or ceiling effects, and had excellent internal consistency (Cronbach's α =0.93). All item-total correlations were high (0.73-0.88). The test-retest reliability of single items varied from 0.74 to 0.91 and was 0.93 for the overall score. The confirmatory factor analysis yielded an excellent fit for a five-item version and provided tentative support for the original six-item version. The convergent validity correlations were in the hypothesized directions, thus supporting the construct validity.

CONCLUSIONS

The brief QOLIBRI-OS is a valid and reliable brief health-related outcome measure that is appropriate for screening HRQOL in patients after stroke.

Baduanjin Exercise for Stroke Rehabilitation: A Systematic Review with Meta-Analysis of Randomized Controlled Trials

Objective: The purpose of this review was to objectively evaluate the effects of Baduanjin exercise on rehabilitative outcomes in stroke patients. Methods: Both Chinese and English electronic databases were searched for potentially relevant trials. Two review authors independently screened eligible trials against the inclusion criteria, extracted data, and assessed the methodological quality by using the revised PEDro scale. Meta-analysis was only performed for balance function. Results: In total, there were eight randomized controlled trials selected in this systematic review. The aggregated result of four trials has shown a significant benefit in favor of Baduanjin on balance function (Hedges’ g = 2.39, 95% CI 2.14 to 2.65, p < 0.001, I² = 61.54). Additionally, Baduanjin exercise effectively improved sensorimotor function of lower extremities and ability of daily activities as well as reduced depressive level, leading to improved quality of life. Conclusion: Baduanjin exercise as an adjunctive and safe method may be conducive to help stroke patients achieve the best possible short-term outcome and should be integrated with mainstream rehabilitation programs. More rigorous randomized controlled trials with long-term intervention periods among a large sample size of stroke patients are needed to draw a firm conclusion regarding the rehabilitative effects for this population.