Translation, Cultural Adaptation, and Validation of the Cantonese Version of SarQoL in Hong Kong's Older Population: An Interviewer-Administered Questionnaire for Assessing Sarcopenia-Specific Quality of Life in Fieldwork Practice.

Objective: This study examined the psychometric properties of the Cantonese version of the SarQoL^® questionnaire.

Participants: A total of 118 (including 60 non-sarcopenic and 58 sarcopenic) community-dwelling older adults aged 65 years or above with Cantonese as their mother tongue.

Methods: Translation and cultural adaptation of the SarQoL were conducted using a standardized protocol. To validate the Cantonese SarQoL, psychometric properties including discriminative power, reliability (including internal consistency and test-retest reliability), and construct validity (including convergent and divergent validity), as well as floor and ceiling effects, were assessed.

Results: The translation of the questionnaire was completed without significant difficulties. Results indicated that the Cantonese SarQoL had (1) good discriminative power (sarcopenic participants had lower overall scores, mean = 66.1 vs 75.0, p < 0.001; the overall score was negatively predictive of the presence of sarcopenia, adjusted OR = 0.949, 95% CI = [0.912, 0.983]), (2) good internal consistency (Cronbach's alpha = 0.835; correlations between domain and overall scores ranged from 0.576 to 0.868), (3) excellent test-retest agreement (intraclass correlation coefficient = 0.801), (4) good construct validity (convergent: moderate to strong correlations were found between the overall score and almost all of the SF-36 and EQ-5D domains; divergent: weaker correlations were found between the overall score and SF-36 social functioning, ρ = -0.098, and EQ-5D self-care, ρ = -0.331), and (5) no floor or ceiling effect.

Conclusion: The Cantonese SarQoL is valid and reliable, and thus can be used as an interviewer-administered questionnaire for assessing sarcopenia-specific quality of life in fieldwork practice.