Nascimento-Ferreira, Marcus Vinicius
Ferreira de Moraes, Augusto Cesar
Maria Monsalve-Alvarez, Julia
Delgado, Carlos A.
Bove, Maria Isabel
Moreno, Luis A.
Total Authors: 9
 Univ Sao Paulo, Fac Med, YCARE Youth Child cArdiovasc Risk & Environm Res, Sao Paulo, SP - Brazil
 Univ Sao Paulo, Sch Publ Hlth, Dept Epidemiol, Sao Paulo, SP - Brazil
Objectives: To assess the psychometric properties of 4-item questionnaire about sleep habits and time in South American children (3-10 years) and adolescents (11-18 years). Material and Methods: We evaluated 459 participants from seven South American cities. Two items from week and weekend days wake up time and bedtime were asked twice, with a 2-week interval. We calculated time spent in bed (subtracting wake up time from bedtime). Participants also answered the Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) sleep time questionnaire. Results: The questionnaire showed acceptable temporal stability in children and adolescents on total days (rho >= 0.30; p<0.05). For total days, the questionnaire presented acceptable convergent validity only in children (rho from 0.48 to 0.62; p <= 0.01) compared with the HELENA questionnaire. Conclusion: The 4-item questionnaire is a reliable and valid tool for children; however, its validity is not consistent in adolescents for sleep habits and time. (AU)