Table 3.

Repeated Measures Correlations for PHQ-8 Survey Score and Smartphone Measures

Smartphone sensor measure	Correlation coefficient (r)	P	95% CI
PHQ-8 survey administration duration	0.151	0.004∗∗	(0.048-0.251)
Distance diameter	0.013	0.85	(−0.115 to 0.140)
Distance from home	0.173	0.008∗∗	(0.057-0.294)
Distance traveled	0.014	0.83	(−0.114 to 0.141)
Flight distance, average	0.008	0.90	(−0.119 to 0.135)
Flight distance, SD	0.021	0.75	(−0.106 to 0.148)
Flight duration, average	−0.066	0.31	(−0.192 to 0.062)
Flight duration, SD	−0.094	0.15	(−0.219 to 0.034)
Time spent at home	−0.147	0.024∗	(−0.269 to −0.020)
Gyration radius	0.006	0.92	(−0.121 to 0.134)
Significant location count	−0.055	0.40	(−0.181 to 0.073)
Significant location entropy	−0.070	0.28	(−0.196 to 0.058)
Pause time	−0.081	0.21	(−0.207 to 0.047)
Total flight time	−0.054	0.41	(−0.180 to 0.074)
Pause duration, average	−0.014	0.83	(−0.142 to 0.113)
Pause duration, SD	0.025	0.70	(−0.103 to 0.152)
Walking time	−0.026	0.65	(−0.137 to 0.085)
Steps	−0.028	0.62	(−0.139 to 0.083)
Cadence	−0.024	0.67	(−0.135 to 0.087)