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Abstract Objectives The objective of this study is to assess the concordance and its association with sociocultural background of a four‐question survey with accelerometry in a multiethnic adolescent population, regarding sleep components. Based on questions from the Pittsburgh Sleep Quality Index and adapted to a school context, the questionnaire focussed on estimating sleep onset time, wake‐up time and sleep duration on both weekdays and weekends. This subjective survey was compared with accelerometry data while also considering the influence of sociocultural factors (sex, place of living, ethnic community and socio‐economic status). Methods Adolescents aged 10.5–16 years ( n = 182) in New Caledonia completed the survey and wore an accelerometer for seven consecutive days. Accelerometry was used to determine sleep onset and wake‐up time using validated algorithms. Based on response comparison, Bland–Altman plots provided agreement between subjective answers and objective measures. We categorized participants' answers to the survey into underestimated , aligned and overestimated categories based on time discrepancies with accelerometry data. Multinomial regressions highlighted the sociocultural factors associated with discrepancies. Results Concordance between the accelerometer and self‐reported assessments was low particularly during weekends (18%, 26% and 19% aligned for onset sleep time, wake‐up time and sleep duration respectively) compared with weekdays (36%, 53% and 31% aligned, respectively). This means that the overall concordance was less than 30%. When considering the sociocultural factors, only place of living was associated with discrepancies in onset sleep time and wake‐up time primarily on weekdays. Rural adolescents were more likely to overestimate both onset sleep time (B = −1.97, p < 0.001) and wake‐up time (B = −1.69, p = 0.003). Conclusions The study found low concordance between self‐assessment and accelerometry outputs for sleep components. This was particularly low for weekend days and for participants living in rural areas. While the adapted four‐item questionnaire was useful and easy to complete, caution should be taken when making conclusions about sleep habits based solely on this measurement.
Wattelez et al. (Wed,) studied this question.