Table 1 Demographic characteristics of participants
From: Divergent biological pathways linking short and long sleep durations to mental and physical health
Variables | Baseline (2006–2010) | Imaging visit (2014+) | ||
|---|---|---|---|---|
Sleep ≤7 h n = 315,628 | Sleep ≥7 h n = 375,028 | Sleep ≤7 h n = 31,056 | Sleep ≥7 h n = 36,794 | |
Age (years; mean ± s.d.) | 56.1 ± 8.0 | 56.6 ± 8.2 | 63.6 ± 7.8 | 64.4 ± 7.7 |
Sex (female, %) | 167,560 (53.1%) | 204,982 (54.7%) | 16,490 (53.1%) | 18,520 (50.3%) |
Townsend deprivation index (mean ± s.d.) | −1.2 ± 3.1 | −1.5 ± 3.0 | −1.8 ± 2.7 | −1.9 ± 2.7 |
BMI | 27.4 ± 4.8 | 27.2 ± 4.7 | 26.6 ± 4.5 | 26.4 ± 4.4 |
Educational qualification (%) | ||||
Degree level | 105,241 (33.3%) | 126,103 (33.6%) | 15,086 (48.6%) | 18,409 (50.0%) |
Other | 155,348 (49.2%) | 183,134 (48.8%) | 13,910 (44.8%) | 15,998 (43.5%) |
Missing data | 55,039 (17.5%) | 65,791 (17.6%) | 2,060 (6.6%) | 2,387 (6.5%) |
Smoking status (%) | ||||
Never | 172,628 (54.7%) | 207,176 (55.2%) | 19,210 (61.9%) | 22,869 (62.2%) |
Previous | 107,719 (34.1%) | 129,800 (34.6%) | 10,648 (34.3%) | 12,583 (34.2%) |
Current | 34,144 (10.8%) | 36,778 (9.8%) | 1,089 (3.5%) | 1,234 (3.4%) |
Missing data | 1,137 (0.4%) | 1,274 (0.4%) | 109 (0.2%) | 108 (0.2%) |
Drinking status (%) | ||||
Never | 13,532 (4.3%) | 15,431 (4.1%) | 1,022 (3.3%) | 1,163 (3.1%) |
Previous | 11,066 (3.5%) | 12,352 (3.3%) | 1,033 (3.3%) | 1,176 (3.2%) |
Current | 290,687 (92.1%) | 346,889 (92.5%) | 28,991 (93.3%) | 34,443 (93.6%) |
Missing data | 343 (0.1%) | 356 (0.1%) | 10 (0.1%) | 12 (0.1%) |
Sleep duration (h; mean ± s.d.) | 6.50 ± 0.72 | 7.63 ± 0.79 | 6.53 ± 0.68 | 7.59 ± 0.74 |
