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For these analyses, all activity variables (e.g., time spent in TV-viewing, light PA, and MVPA), except the activity of interest which was dropped (e.g., sleeping time), were entered simultaneously into the models, along with a total discretionary time and covariates as follows: h(t) = h0(t) exp [β1(TV-viewing) + β2(light PA) + β3(MVPA) + β4(total discretionary time) + β5(covariates)], where t = 1.
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