Comportamentos sedentários como fatores discriminantes da percepção negativa do sono: Um estudo de base populacional escolar

Abstract

High exposure to sedentary behavior has been associated with negative health outcomes in adolescents, but little is known about how much time exposed to these behaviors is capable of discriminating negative sleep perception in this population. The objective of this study was to test the time spent in sedentary behavior as a discriminant criterion for negative sleep perception in adolescent high school students from public and private schools in a large Brazilian municipality. This is a cross-sectional study. The test variable was sedentary behavior (sitting time, screen time, and smartphone use time), measured by questionnaire. Negative self-perception of sleep was obtained through the question: “How often do you consider that you sleep well?”. The answers followed a Likert scale and negative sleep perception was considered for the answers: “sometimes”; “almost never”; “never”. Discriminatory capacity, cutoff points, and sensitivity and specificity were identified from Receiver Operating Characteristic (ROC) curves with a significant area under the curve (AUC) when greater than 50% (AUC > 0.50). The final sample consisted of 959 schoolchildren (54.7% women). The lowest cutoff points identified were: sitting time, 272 minutes (AUC = 0.56 (0.55-0.57)); screen time, 172 minutes (AUC = 0.55 (0.54-0.56)); smartphone use time, 265 minutes (AUC = 0.54 (0.53-0.55)). Smartphone use was the sedentary behavior that presented the highest cutoff points. However, the use of these values should not override the recommendations of national guidelines.