Table 1.
Characteristics of adolescents in a study on secondhand smoke (SHS) exposure and sleep (N = 1,592).
| Frequency of restless sleepa | Totalb | ||||
|---|---|---|---|---|---|
| Rarely or none of the time (<1 day) | Some or a little of the time (1-2 days) | Occasionally or a moderate amount of the time (3-4 days) | Most or all of the time (5–7 days) | ||
| Demographics | |||||
| Gender, n (%) | |||||
| Male | 331 (45.5) | 150 (37.3) | 62 (32.5) | 35 (26.9) | 653 (41) |
| Female | 396 (54.4) | 252 (62.7) | 129 (67.5) | 95 (73.1) | 931 (59) |
|
| |||||
| Age, mean (SD) | |||||
| Years | 14.8 (0.7) | 14.8 (0.6) | 14.9 (0.7) | 14.9 (0.7) | 14.8 (0.7) |
|
| |||||
| Ethnicity, n (%) | |||||
| Caucasian | 386 (55.7) | 257 (66.6) | 118 (64.5) | 79 (64.2) | 868 (60) |
| Aboriginal | 22 (3.2) | 12 (3.1) | 9 (4.9) | 6 (4.9) | 55 (4) |
| Asian | 250 (36.1) | 96 (24.9) | 50 (27.3) | 33 (26.8) | 456 (31) |
| Other | 35 (5.1) | 21 (5.4) | 6 (3.3) | 5 (4.1) | 75 (5) |
|
| |||||
| Family income, n (%) | |||||
| Below average | 121 (17.9) | 83 (22.3) | 54 (29.5) | 35 (29.4) | 305 (22) |
| Average | 236 (35.0) | 132 (35.4) | 62 (33.9) | 39 (32.8) | 492 (35) |
| Above average | 318 (47.1) | 158 (42.4) | 67 (36.6) | 45 (37.8) | 615 (44) |
|
| |||||
| Weekday nighttime sleep, mean (SD) | |||||
| Hours | 8.7 (1.0) | 8.7 (0.9) | 8.5 (1.1) | 8.2 (1.1) | 8.6 (1.0) |
|
| |||||
| Weekend nighttime sleep, mean (SD) | |||||
| Hours | 9.8 (1.0) | 9.9 (1.0) | 9.6 (1.1) | 9.7 (1.1) | 9.8 (1.0) |
|
| |||||
| Adolescents' tobacco use | |||||
| Smoked in the past 30 days, n (%) | |||||
| Yes | 28 (3.9) | 13 (3.2) | 15 (7.7) | 10 (7.7) | 76 (5) |
|
| |||||
| SHS exposure | |||||
| Overall SHS exposure in the past month, n (%) | |||||
| Never | 133 (18.5) | 44 (11.1) | 17 (8.8) | 12 (9.4) | 236 (15) |
| At least once in the past month | 321 (44.6) | 184 (46.2) | 72 (37.3) | 52 (40.6) | 661 (43) |
| At least once a week | 187 (26.0) | 118 (29.6) | 64 (33.2) | 34 (26.6) | 423 (28) |
| Every day or almost every day | 78 (10.8) | 52 (13.1) | 40 (20.7) | 30 (23.4) | 215 (14) |
aThese columns display data from participants who answered both the restless sleep and the specific demographic, tobacco use, and/or SHS exposure questions.
bThis column displays data from participants who answered the specific demographic, tobacco use, and/or SHS exposure questions regardless of whether they answered the restless sleep question.