Table 1 Characteristics of Whitehall II sample at Phase 11 (2012–2013).

From: The association between alcohol consumption and sleep disorders among older people in the general population

 Men n (%)Women n (%)Chi-squared test
 43341783 
Mean age (years)69.469.6 
Alcohol volume per week
Non-drinkera263 (6.1)287 (16.1) 
None in the past week441 (10.2)351 (19.7) 
1–14 unitsb2384 (55.0)999 (56.0) 
14–21 units566 (13.1)103 (5.8) 
21+ units680 (15.7)43 (2.4)P < 0.001
AUDIT case-ness (>5)c
No2872 (69.5)1322 (87.2) 
Yes1,258 (30.5)194 (12.8)P < 0.001
Sleep duration (hours per night)
<72797 (63.7)980 (54.4) 
7+1596 (36.3)823 (45.6)P < 0.001
Trouble staying asleep (days per month)
None/1–3 days2659 (60.9)1003 (55.7) 
4+ days1708 (39.1)797 (44.3)P < 0.001
Trouble falling asleep (days per month)
None2212 (50.5)547 (30.4) 
1+ days2168 (49.5)1250 (69.6)P < 0.001
Wake as usual but tired (days per month)
None2108 (48.2)740 (41.1) 
1+ days2269 (51.8)1059 (58.9)P < 0.001
Wake several times a night (days/month)
None/1–3 days1867 (42.7)731 (40.8) 
4+ days2503 (57.3)1060 (59.2)P = 0.168
  1. aNon-drinker defined as not having a drink in the past year.
  2. b1 unit = 8 grams of alcohol.
  3. cExcludes non-drinkers.