Table 2.

Subgroup analysis of the within-individual proximal effect.

	Group A		Group B
	β coefficient (SE; 95% CI)	P value	β coefficient (SE; 95% CI)	P value
Intercept (no feedback)	7 h 20 min (17 min; 6 h 41 min to 7 h 44 min)	<.001	6 h 32 min (18 min; 6 h 2 min to 7 h 11 min)	<.001
Age	−3 (1; −5 to −1) min	.005	−3 (1; −5 to −1) min	.02
Sex	8 (22; −33 to 49) min	.72	1 h 4 min (46 min; −25 min to 2 h 33 min)	.17
Sleep hours	−3 (5; −12 to 7) min	.60	3 (4; −3 to 10) min	.35
Feedback	−1 (21; −41 to 39) min	.96	59 min (22 min; 17 min to 1 h 42 min)	.007
Day	1 (2; −2 to 5) min	.44	3 (2; −1 to 7) min	.21
Feedback×day	−2 (3; −7 to 4) min	.57	−6 (3; −11 to 0) min	.07