Validity and reliability of a Nigerian-Yoruba version of the stroke-specific quality of life scale 2.0

Abstract

BackgroundPsychometric evidence is necessary to establish scientific integrity and clinical usefulness of translations and cultural adaptations of the Stroke-Specific Quality of Life (SS-QoL) scale. However, the limited evidence on psychometrics of Yoruba version of SS-QoL 2.0 (SS-QoL(Y)) is a significant shortcoming. This study assessed the test-retest reliability, internal consistency, convergent, divergent, discriminant and known-group validity of the SS-QoL(Y).MethodsYoruba version of the WHOQoL-BREF was used to test the convergent and divergent validity of the SS-QoL(Y) among 100 consenting stroke survivors. The WHOQoL-BREF and SS-QoL(Y) was administered randomly in order to eliminate bias. The test-retest reliability of the SS-QoL(Y) was carried out among 68 of the respondents within an interval of 7 days. All respondents were purposively recruited from selected secondary and tertiary health facilities in South-west Nigeria. Data were analysed using descriptive statistics of mean and standard deviation, and inferential statistics of Spearman correlation, Cronbach’s alpha, Intra-class Correlation Coefficient (ICC), Independent t-test and One-way ANOVA. Alpha level was set at p < 0.05.ResultThe physical health, psychological health, social relationship and environment domains on WHOQoL-BREF with correlation coefficient that ranged from 0.214 to 0.360 showed significant correlation with similar domains on SS-QoL(Y). Dissimilar domains between the two scales had r values from 0.035 to 0.366. Discriminant validity of SS-QoL(Y) showed that items’ r value ranged from 0.711 to 0.920 with their hypothesized domains. The scale demonstrated moderate to strong test-retest reliability with Intra-class correlation coefficient (ICC) for the domains and overall scores (r = 0.47 to 0.81) and moderate to high internal consistency (Cronbach’s alpha =0.61 to 0.82) for domains scores. These correlations were also significant for the domains and overall scores (p < 0.05). There were no significant differences across different age groups or gender for the domains or overall scores of SS-QoL(Y).ConclusionsDiscriminant and known-group validity, test-retest reliability and internal consistency of the Yoruba version of the Stroke Specific Quality of Life 2.0 are adequate while the convergent and divergent validity are low but acceptable. The SS-QoL(Y) is recommended for assessing health-related quality of life among Yoruba stroke survivors.Electronic supplementary materialThe online version of this article (10.1186/s12955-017-0775-9) contains supplementary material, which is available to authorized users.

Cross-cultural adaptatiion and validation of the stroke specific quality of life 2.0 scale into Hausa language

“…The mean age of participants at onset of stroke was 58.33 ± 11.54 years. These findings support the earlier reports that stroke occurs more frequently in middle age [21, 22, 26, 28, 38–41]. Strokes can occur at any age, though its risk increases with age, [42] while stroke duration varies extensively among the survivors.…”

“…Zip was written as ‘zif’ in Hausa language. This was also the case in cross-cultural adaptation of SS-QoL 2.0 into Yoruba language in which the words ‘zip’ and ‘button’ were written as ‘siipu’ and ‘bọtini’ [26]. Back-translation of the Hausa version of SS-QoL 2.0 scale revealed discrepancies, inconsistencies and omission in twelve items/expressions.…”

“…The close proportion reported for right and left hemiplegia/hemiparesis reported in this study may be due to the sample size and the use of only two hospitals for data collection. A similar study by Odetunde et al [26] involved 100 stroke survivors across 8 different hospitals.…”

“…The SS-QoL 2.0 has been cross-culturally adapted into Yoruba, the indigenous language of the people of South-western Nigeria using the guidelines of American Association of Orthopaedic Surgeons (AAOS) by Akinpelu et al [25], and validated by Odetunde et al [26]. The AAOS guidelines have been used by other authors to conduct cross-cultural adaptation of SS-QoL 2.0 to other languages.…”

The Effect of a Family-centered Empowerment Model on the Quality of Life of Patients With Stroke

“…Scores between 49 and 123 indicate low quality of life, and scores between 124 and 249 indicate good quality of life (Williams et al, 1999). Odetunde, Akinpelu & Odole (2017) recognized the reliability of SSQOL. In Iran, Ganvir, Harishch & Kunde (2018) confirmed the reliability of this scale.…”