Table 2.
Three class solution class comparisons (means (SD) / percentages) for continuous and categorical sleep indicators, sleep measures not in the mixture model, and CES-D.
| Class A (n=751) | Class B (n=428) | Class C (n=272) | partial η2/Cramér’s V | |
|---|---|---|---|---|
| Continuous indicators (means (SD)) | ||||
| BT | 22.95 (0.6) | 23.47 (0.6) | 24.84 (0.7) | 0.54* |
| RT | 6.50 (0.7) | 6.68 (0.6) | 6.84 (0.7) | 0.04* |
| dBT | 1.46 (0.9) | 0.98 (0.9) | 0.44 (1.2) | 0.14* |
| dRT | 2.70 (1.3) | 2.60 (1.2) | 3.39 (1.4) | 0.05* |
| Categorical indicators (percentages) | ||||
| SOL (0,1,2) | 43,43,14 | 95,4,1 | 78,17,5 | 0.34* |
| NOA (0,1,2) | 46,5,50 | 96,1,3 | 84,2,15 | 0.35* |
| NAPS (0,1,2) | 57,27,16 | 59,31,10 | 11,35,54 | 0.31* |
| PSQ (0,1,2) | 10,69,21 | 40,57,3 | 7,60,34 | 0.30* |
| SD (0,1,2) | 0,89,11 | 30,70,0 | 10,83,7 | 0.31* |
| Sleep variables not entered in the mixture model (means (SD)) | ||||
| BSS | 5.30 (4.00) | 4.72 (3.62) | 7.68 (4.94) | 0.06* |
| HÖQ | 50.21 (8.02) | 50.29 (8.24) | 43.68 (7.95) | 0.09* |
| TIB (school-nights) | 7.58 (0.83) | 7.22 (0.78) | 5.96 (01.99) | 0.34* |
| TIB (non-school-nights) | 8.79 (1.26) | 8.84 (1.11) | 8.95 (1.46) | 0.002 |
| Depression (means (SD)) | ||||
| CES-D | 12.23 (8.19) | 9.48 (7.00) | 13.87 (9.04) | 0.04* |
*
p<0.001;
BT: bedtime, RT: rise time, dBT: difference in BT between non-school night and school night, dRT: difference in RT between non-school night and school night, SOL: sleep onset latency (school nights), NOA: number of awakenings (school-nights), PSQ: perceived sleep quality, SD: sleep disturbance, BSS: Bradley Sleepiness Scale, HÖQ: Horne-Östeberg Questionnaire, TIB: time in bed, CES-D: Center for Epidemiologic Studies - Depression Scale, η2 : eta squared.