Table 1.
Means, SDs, and correlations of app-generated parameters, and the total score of the 5-item Smartphone Addiction Inventory.
| Number | Parameters | Mean (SD) | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1 | Fa | 57.29 (22.96) | —b | — | — | — | — | — | — |
| 2 | Dc (second) | 20666.96 (12702.38) | −.078 | — | — | — | — | — | — |
| 3 | PFd | 22.97 (14.11) | .688e | −.103 | — | — | — | — | — |
| 4 | PDf (second) | 4806.66 (10279.38) | −.218 | .551e | .180 | — | — | — | — |
| 5 | RMSSDg | 3070.41 (1421.50) | −.724e | .140 | −.428h | .356h | — | — | — |
| 6 | SIi | 1417.35 (853.55) | −.803e | .164 | −.466e | .368h | .934e | — | — |
| 7 | CIj | 1949.38 (1492.87) | −.666e | .608e | −.347h | .727e | .777e | .838e | — |
| 8 | SPAI-5k | 12.55 (2.41) | −.089 | .297 | −.136 | .403h | .139 | .099 | .314 |
aF: total use frequency.
b—:not applicable.
cD: total use duration.
dPF: proactive use frequency.
eP<.01.
fPD: proactive use duration.
gRMSSD: root mean square of the successive differences (between the adjacent duration of use and nonuse episodes).
hP<.05.
iSI: Similarity Index.
jCI: Control Index.
kSPAI-5: 5-item Smartphone Addiction Inventory.