Table 2.
Sleep stage variables
| Sleep Variable | Initial |
Follow-Up |
P-Values |
||||
|---|---|---|---|---|---|---|---|
| Girls | Boys | Girls | Boys | Sex | Time | Sex X Time | |
| Stage 1 | 38 (14) | 31 (12) | 30 (8) | 48 (13) | 0.28 | 0.41 | 0.02 |
| Stage 2 | 186 (44) | 217 (45) | 259 (46) | 244 (25) | 0.60 | 0.004 | 0.15 |
| SWS | 230 (53) | 216 (36) | 168 (69) | 151 (44) | 0.42 | 0.003 | 0.94 |
| REM | 105 (28) | 105 (25) | 109 (22) | 116 (24) | 0.87 | 0.85 | 0.28 |
| WASO | 21 (23) | 12 (10) | 11 (14) | 14 (15) | 0.63 | 0.56 | 0.32 |
| Sleep Latency | 16 (8) | 13 (9) | 18 (2) | 17 (22) | 0.71 | 0.61 | 0.87 |
| REM Latency | 117 (47) | 155 (34) | 109 (21) | 128 (63) | 0.13 | 0.33 | 0.61 |
| Total Sleep Time | 559 (22) | 569 (17) | 567 (13) | 559 (26) | 0.87 | 0.85 | 0.28 |
| Total Recording Time | 600 (8) | 601 (7) | 600 (1) | 600 (1) | 0.88 | 0.64 | 0.85 |
Means (standard deviations) in minutes and P-values of sleep stage variables.
SWS, slow wave sleep; WASO, wake after sleep onset; Sex, main effect of sex (male versus female); Time, main effect of recording session (Initial versus Follow-Up); Sex X Time, interaction of Sex and Time.