Salud Pública de México
Print version ISSN 0036-3634
HERNANDEZ, Bernardo et al. Validity and reproducibility of a physical activity and inactivity questionnaire for Mexico City's schoolchildren. Salud pública Méx [online]. 2000, vol.42, n.4, pp.315-323. ISSN 0036-3634. http://dx.doi.org/10.1590/S0036-36342000000400006.
OBJECTIVE: To assess the validity and reproducibility of a self-reported questionnaire on physical activity and inactivity, developed for children aged 10-14 in Mexico City. MATERIAL AND METHODS: Between May and December 1996, a self-reported physical activity and inactivity questionnaire was developed and applied twice to a sample of 114 students aged 10 to 14, from a low and middle income population of Mexico City. The children's mothers completed the same questionnaire, and two 24-hour recalls of physical activity were used for comparison. Statistical analysis consisted of central tendency and dispersion measures and Pearson's correlation coefficient. RESULTS: Correlations between hours per day spent in physical activity and inactivity from the children's questionnaire and the 24-hour recall data, were 0.03 for moderate activity, 0.15 for vigorous activity, and 0.51 (p=0.001) for watching television, adjusted by age, gender, town, and illness prior to the administration of the questionnaire. Compared to the 24-hour recall data, the questionnaire overestimated the time spent watching television, reading or participating in vigorous activity, and underestimated the time engaged in moderate activity. Statistically significant (p<0.05) six-month reproducibility values were observed for watching television (r=0.53), sleeping (r= 0.40), moderate (r=0.38), and vigorous activity (r=0.55). CONCLUSIONS: Among children of Mexico City aged 10-14, the questionnaire showed acceptable validity in estimating the time watching television, and acceptable reproducibility of the time watching television, vigorous and moderate activity.
Keywords : exertion; physical inactivity; questionnaires; reproducibility of results; Mexico.