Table 2.
Comparison of 6 weeks of digital phenotyping data before (from 45 days before to 3 days before) and after (from 3 days after to 45 days after) the start of Singapore’s Circuit Breaker on April 7, 2020.
| Feature name | 6-week before CBa starts, mean (SD) | 6-week after CB starts, mean (SD) | P value (paired t test) | P value (Wilcoxon signed rank test) | |
| Smartphone features | |||||
|
|
accel_L_std (L: length of the accel. vector) | 0.526 (0.325) | 0.370 (0.345) | <.001 | <.001 |
|
|
accel_ddt_max (ddt: time derivative) | 0.00807 (0.0044) | 0.00551 (0.0041) | .005 | <.001 |
|
|
ambientLight.hourly_max_log1p_lux | 2.538 (0.721) | 2.190 (0.587) | .001 | .001 |
|
|
callLog_Incoming Call | 0.533 (0.835) | 0.288 (0.560) | .001 | <.001 |
|
|
gps-mobility_Hometime / mins | 1111 (292) | 1328 (143) | <.001 | <.001 |
|
|
gps-mobility_SigLocsVisited | 1.354 (0.429) | 1.220 (0.288) | .01 | .02 |
|
|
powerState.hourly_n_screen_on | 6.716 (2.77) | 5.180 (2.44) | .008 | <.01 |
|
|
tapsLog.daily_n_unique_apps | 16.10 (4.54) | 14.24 (4.47) | .04 | .04 |
|
|
tapsLog.daily_n_taps_in_entertainment | 293.9 (259) | 378.3 (365) | .07 | .05 |
| Wrist-wearable features | |||||
|
|
steps.daily_n_steps | 3921 (2435) | 2400 (1807) | .001 | <.001 |
|
|
steps.daily_n_mins_walk | 113.8 (53.23) | 79.78 (54.24) | <.001 | <.001 |
|
|
heart.daily_HR_mean | 82.89 (10.48) | 80.35 (9.04) | .10 | .03 |
|
|
heart.daily_HR_min | 56.08 (6.85) | 55.74 (7.23) | .77 | .26 |
|
|
sleep_total_hrs | 9.196 (1.94) | 8.727 (1.98) | .31 | .096 |
|
|
sleep_mean_efficiency | 93.27 (3.08) | 92.39 (3.38) | .04 | .009 |
aCB: circuit breaker.