Table 2.
Summary statistics of daily mental-health ratings and indicator variables based on the ratio approach.
|
|
n | Mean | SD | Min. | Med. | Max. | Skew. | Kurt. | Cut-offd |
| Sleep ratinga,b | 5792 | 4.99 | 2.03 | 1.00 | 5 | 10 | –0.10 | 2.685 | ‒ |
| Mood ratinga | 5792 | 3.19 | 1.29 | 1.00 | 3 | 7 | 0.372 | 2.832 | ‒ |
| Anxiety ratinga | 5792 | 4.21 | 2.07 | 0.00 | 5 | 10 | –0.075 | 2.295 | ‒ |
| Depressed | 497 | 0.46 | 0.50 | 0.00 | 0.00 | 1.00 | 0.174 | 1.030 | 5 |
| Sleepb,c | 497 | 0.21 | 0.23 | 0.00 | 0.14 | 1.00 | 1.167 | 3.951 | 7 |
| Moodc | 497 | 0.40 | 0.38 | 0.00 | 0.33 | 1.00 | 0.388 | 1.590 | 4 |
| Anxietyc | 497 | 0.30 | 0.32 | 0.00 | 0.2 | 1.00 | 0.801 | 2.474 | 6 |
aDaily mental-health ratings.
bSleep rating and Sleep indicate sleep dissatisfaction (the reversed scale of sleep satisfaction).
cThe indicator variables based on the ratio approach.
dThe cut-off value of Depressed is selected based on prior literature. The cut-off values for Sleep, Mood, and Anxiety are calculated based on the simulation analysis described in the Methods section. The cut-off values obtained by using the frequency and average approaches are the same.