Table 2.
Means and Standard Deviations for School-Night and Weekend Sleep-Wake Variables by Age and Sex
| Sleep-wake Variable | Age group |
Sex |
F Value |
Bonferroni ta | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 12–13 Years (n = 364) | 14 Years (n = 364) | 15 Years (n = 297) | 16 Years (n = 270) | 17–19 Years (n = 245) | Male (n = 766) | Female (n = 774) | Age | Sex | ||
| School night bedtime | 23:00 | 23:23 | 23:26 | 23:35 | 23:47 | 23:20 | 23:28 | 12–13 < 14, 15 < 17–19 | ||
| (56) | (63) | (67) | (66) | (76) | (69) | (65) | 22.6*** | 3.5 | 12–13 < 16 | |
| School night rise time | 06:57 | 06:59 | 07:01 | 06:58 | 06:52 | 06:56 | 06:57 | |||
| (38) | (43) | (51) | (48) | (35) | (33) | (43) | 1.7 | 0.3 | --- | |
| School night TSTb, min | 470 | 445 | 435 | 421 | 397 | 442 | 433 | 12–13 > 14 > 16 > 17–19 | ||
| (79) | (76) | (75) | (78) | (70) | (79) | (80) | 38.1*** | 2.1 | 12–13 > 15 > 17–19 | |
| Weekend bedtime | 00:03 | 00:29 | 00:31 | 00:40 | 00:46 | 00:23 | 00:32 | |||
| (90) | (103) | (94) | (96) | (101) | (106) | (89) | 10.3*** | 1.1 | 12–13 < 14, 15, 16, 17–19 | |
| Weekend rise time | 09:50 | 10:15 | 10:23 | 10:19 | 10:26 | 9:55 | 10:31 | |||
| (101) | (105) | (111) | (114) | (117) | (118) | (98) | 5.5*** | 35.4*** | 12–13 < 14, 15, 16, 17–19 | |
| Weekend TST, min | 572 | 575 | 575 | 553 | 556 | 550 | 585 | |||
| (110) | (108) | (104) | (103) | (102) | (107) | (103) | 3.4** | 40.5*** | --- | |
| Weekend oversleep, min | 101 | 128 | 143 | 133 | 160 | 107 | 153 | 12–13 < 14 < 17–19 | ||
| (119) | (114) | (110) | (113) | (116) | (115) | (112) | 9.6*** | 52.2*** | 12–13 < 15, 16 | |
| Weekend delay, min | 62 | 65 | 65 | 65 | 60 | 64 | 63 | |||
| (71) | (81) | (85) | (83) | (98) | (91) | (74) | 0.11 | 0.18 | --- | |
a
Significant difference between age groups, P <0.05. bTST refers to total sleep time. **P <0.01, ***P <0.001.