Table 2.

Isotemporal substitution (30-min substitutions) between different forms of screen time, physical activity, and sleep at baseline predicting follow-up BMI z-score in females and males (β [95% CI]) (N = 10,544)

	Decrease by 30 min
	Females (n = 5,058)
Increase by 30 min	↓ Socializing	↓ Streaming	↓ Gaming	↓ Physical Activity	↓ Sleep
↑ Socializing	-	-0.003 (-0.01, 0.01)	-0.005 (-0.02, 0.01)	0.03 (0.002, 0.05)*	0.002 (-0.01, 0.01)
↑ Streaming	.003 (-0.01, 0.01)	-	-0.002 (-0.02, 0.01)	0.03 (0.01, 0.05)**	0.005 (-0.004, 0.01)
↑ Gaming	0.005 (-0.01, 0.02)	0.002 (-0.01, 0.02)	-	0.03 (0.01, 0.06)*	0.01 (-0.01, 0.02)
↑ Physical Activity	-0.03 (-0.05, -0.002)*	-0.03 (-0.05, -0.01)**	-0.03 (-0.06, -0.01)*	-	-0.02 (-0.05, -0.003)*
↑ Sleep	-0.002 (-0.01, 0.01)	-0.005 (-0.01, 0.004)	-0.01 (-0.02, 0.01)	0.02 (0.003, 0.05)*	-
	Males (n = 5,486)
↑ Socializing	-	0.01 (-0.002, 0.02)	0.01 (0.0001, 0.02)*	0.004 (-0.03, 0.04)	0.03 (0.01, 0.05)**
↑ Streaming	-0.01 (-0.02, 0.002)	-	0.001 (-0.005, 0.01)	-0.01 (-0.04, 0.02)	0.02 (0.01, 0.03)***
↑ Gaming	-0.01 (-0.02, -0.0001)*	-0.001 (-0.01, 0.005)	-	-0.01 (-0.04, 0.02)	0.02 (0.01, 0.03)***
↑ Physical Activity	-0.004 (-0.04, 0.03)	0.01 (-0.02, 0.04)	0.01 (-0.02, 0.04)	-	0.02 (-0.01, 0.05)
↑ Sleep	-0.03 (-0.05, -0.01)**	-0.02 (-0.03, -0.01)***	-0.02 (-0.03, -0.01)***	-0.02 (-0.05, 0.01)	-

Models were adjusted for participant age, race/ethnicity, socioeconomic status, internalizing symptoms, and BMI z-score at baseline. Time spent in each behavior (except the behavior being replaced) and total time were simultaneous predictors in each model. *P < .05, **P < .01, ***P < .001