The relationship between cell phone use, physical and sedentary activity, and cardiorespiratory fitness in a sample of U.S. college students

Table 3 Hierarchical regression analyses

	Sex	Self-efficacy	Percent fat	Total cell phone use
	Block 1	Block 2	Block 3	Block 4
	(ΔR², Δ F, p)	(ΔR², Δ F, p)	(ΔR², Δ F, p)	(ΔR², Δ F, p)
VO₂ peak (ml kg·min^-1)	0.18, 10.2, 0.003	0.07, 4.1, 0.049	0.09, 5.8, 0.02	0.06, 4.2, 0.047

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