Baseline characteristics according to self-reported sleep disturbance in ageing men (n=2386)
| Sleep disturbance | Test statistic | p Value | |||
|---|---|---|---|---|---|
| Never/seldom n=799 | Occasionally n=1258 | Often n=329 | |||
| Age years | 54.3 (48.5–54.5) | 54.3 (54.1–54.6) | 54.4 (54.2–54.8) | 15.4* | <0.001* |
| Follow-up years for dementia | 25.9 (20.1–27.8) | 25.3 (17.3–27.7) | 23.6 (12.1–27.2) | 21.7* | <0.001* |
| HPL scale scores ≥5 | 29 (3.6) | 86 (6.9) | 71 (21.6) | 107.9† | <0.001† |
| PA (kcal/day) | 84.1 (29.8–189.1) | 83.8 (30.1–185.1) | 77.1 (26.5–207.2) | 0.1* | 0.953* |
| Alcohol (g/week) | 26.2 (6.0–77.3) | 33.1 (6.4–93.7) | 44.0 (7.0–136.6) | 16.8* | <0.001* |
| Smoking (pack-years) (%) | |||||
| 0 | 565 (72.6) | 877 (71.3) | 214 (66.7) | 10.01† | 0.124† |
| 1–500 | 102 (13.1) | 158 (12.8) | 47 (14.6) | ||
| 501–999 | 94 (12.1) | 161 (13.1) | 43 (13.4) | ||
| >1000 | 17 (2.2) | 34 (2.8) | 17 (5.3) | ||
| Systolic BP (mm Hg) | 131.3 (122.7–142.7) | 132.0 (122.7–144.3) | 133.3 (122.8–144.0) | 1.6* | 0.439* |
| BMI (kg/m2) | 26.2 (24.4–28.6) | 26.6 (24.6–29.1) | 26.3 (24.2–28.8) | 3.6* | 0.167* |
| LDL cholesterol (mmol/L) | 4.0 (3.3–4.7) | 4.0 (3.4–4.7) | 3.9 (3.4–4.6) | 0.2* | 0.974* |
| HDL cholesterol (mmol/L) | 1.3 (1.1–1.5) | 1.3 (1.1–1.5) | 1.2 (1.1–11.5) | 0.1* | 0.974* |
| Hs-CRP (mg/L) | 1.3 (0.7–2.4) | 1.3 (0.7–2.4) | 1.3 (0.7–2.7) | 1.0* | 0.616* |
| CVD history (%) | 128 (16.0) | 246 (19.6) | 89 (27.1) | 18.2† | <0.001† |
| Education (years) | 8.0 (6.0–10.0) | 8.0 (6.0–10.0) | 8.0 (6.0–9.0) | 16.6* | <0.001* |
| Living alone (%) | 43 (5.4) | 81 (6.4) | 20 (6.1) | 1.0† | 0.615† |
*Kruskal-Wallis test, variables are presented as the median (25–75th centiles).
†χ2 test, variables are presented as n (%).
BMI, body mass index; BP, blood pressure; CVD, cardiovascular diseases; HDL, high-density lipoprotein; HPL, Human Population Laboratory Depression scale; Hs-CRP, high-sensitivity C reactive protein; LDL, low-density lipoprotein; PA, physical activity.