Table 1 Characteristics of Whitehall II sample at Phase 11 (2012–2013).
| Men n (%) | Women n (%) | Chi-squared test | |
|---|---|---|---|
| 4334 | 1783 | ||
| Mean age (years) | 69.4 | 69.6 | |
| Alcohol volume per week | |||
| Non-drinkera | 263 (6.1) | 287 (16.1) | |
| None in the past week | 441 (10.2) | 351 (19.7) | |
| 1–14 unitsb | 2384 (55.0) | 999 (56.0) | |
| 14–21 units | 566 (13.1) | 103 (5.8) | |
| 21+ units | 680 (15.7) | 43 (2.4) | P < 0.001 |
| AUDIT case-ness (>5)c | |||
| No | 2872 (69.5) | 1322 (87.2) | |
| Yes | 1,258 (30.5) | 194 (12.8) | P < 0.001 |
| Sleep duration (hours per night) | |||
| <7 | 2797 (63.7) | 980 (54.4) | |
| 7+ | 1596 (36.3) | 823 (45.6) | P < 0.001 |
| Trouble staying asleep (days per month) | |||
| None/1–3 days | 2659 (60.9) | 1003 (55.7) | |
| 4+ days | 1708 (39.1) | 797 (44.3) | P < 0.001 |
| Trouble falling asleep (days per month) | |||
| None | 2212 (50.5) | 547 (30.4) | |
| 1+ days | 2168 (49.5) | 1250 (69.6) | P < 0.001 |
| Wake as usual but tired (days per month) | |||
| None | 2108 (48.2) | 740 (41.1) | |
| 1+ days | 2269 (51.8) | 1059 (58.9) | P < 0.001 |
| Wake several times a night (days/month) | |||
| None/1–3 days | 1867 (42.7) | 731 (40.8) | |
| 4+ days | 2503 (57.3) | 1060 (59.2) | P = 0.168 |
