Figure 2.

Commuting time expressed as minutes (total commuting time-passive). (a) Regression of the objective commuting time (y) vs. (x) the self-reported commuting diary time. The regression equation is y = 9.8 + 0.55x. (b) Bland–Altman plot of the total commuting time between self-reported diary time and objective time (y) vs. average of self-reported diary time and objective time (x). The central dotted line represents the mean of the differences between the objective time measure and the self-reported time measure; the upper and lower dotted lines represent the upper and lower 95% limits of agreement (mean differences + 1.96 standard deviations of the differences), respectively. Adolescents reported 3.86 min less in the total commuting time than the objective time (95% limits of agreement were 29.56 min and −21.84 min).