Table 2.
Descriptive statistics showing discrepancies (in milliseconds) between Usage Logger (continuous logging) and Psych Validator [Usage Logger timestamp-Psych Validator timestamp]
| Device | Nokia | Huawei | Pixel | ||||
|---|---|---|---|---|---|---|---|
| Event | n | M | SD | M | SD | M | SD |
| Screen off | 10 | – 732.8 | 21.5 | 342.9 | 24.37 | – 523.1 | 93.4 |
| Screen on | 10 | – 476.2 | 9.5 | 342.1 | 15.39 | – 502.2 | 157.4 |
| App opened | 20 | 563.6 | 406.9 | – 557.4 | 334.1 | 523.6 | 253.1 |
| Notification generated | 10 | 114.9 | 22.1 | 184.6 | 10.58 | 332.9 | 589.3 |
| Notification removed | 10 | 12.5 | 14.7 | 227.8 | 13.17 | 34.5 | 91.5 |
| App installed | 2 | – 665 | 1652 | – 636.5 | 121.5 | – 2302.5 | 1371.5 |
| App uninstalled | 2 | 2182 | 1117 | 907 | 19 | – 1578.5 | 1368.5 |
M = mean, SD = standard deviation