Fig. 1
Birth weight SD score and length of gestation predicting physical activity and cardiorespiratory fitness. Sex adjusted mean levels (95% CI) of physical activity (METh/week) and cardiorespiratory fitness (ml·kg−1·min−1) in adolescents according to exposure. P values are for linear and quadratic trends for continuous variables. No statistically significant mean differences between categories were found compared with the reference category (Ref.)