Table 3.

Behavioral factors predicting the severity of depression symptoms^a.

		Estimates (95% CI)		P value
Model 1: communication
	Incoming call duration—W	–0.08 (–0.12 to –0.04)	<.001
	Outgoing call duration—W	0.05 (0.00-0.09)	.02
	Number of incoming SMS text messages	0.31 (–0.11 to 0.77)	.14
	Number of outgoing SMS text messages	–0.13 (–0.59 to 0.31)	.56
Model 2: location
	Location log variance—W	–0.10 (–0.44 to 0.18)	.48
	Normalized entropy—W	0.55 (–0.03 to 1.11)	.08
	Distance traveled—W	–0.00 (–0.00 to 0.00)	.12
	SPs	–0.11 (–1.33 to 1.19)	.87
	Percentage of time at home	0.67 (–2.71 to 4.06)	.68
Model 3: duration of phone and app use
	Social media—W	–0.01 (–0.02 to 0.00)	.24
	Communication—W	0.00 (–0.01 to 0.02)	.88
	Games—W	–0.01 (–0.03 to 0.01)	.34
	Leisure—W	–0.01 (–0.02 to 0.00)	.14
	Screen use time—W	0.01 (–0.00 to 0.01)	.10
Model 4: accelerometer
	Magnitude SD morning	–2.05 (–4.18 to –0.20)	.02
	Magnitude SD afternoon	0.30 (–1.49 to 2.15)	.82
	Magnitude SD evening	0.29 (–1.94 to 2.32)	.78
	Magnitude SD night	–0.94 (–6.77 to 3.65)	.66

^aWithin-person mean-centered predictors are suffixed with W. The unit for duration variables is minutes.