From: Postmenopausal hormones and sleep quality in the elderly: a population based study
 | HT use | ||
---|---|---|---|
Parameter | Current | Past | Never |
 | (N = 424) | (N = 1,289) | (N = 1,410) |
Total sleep time, minutes (SD) | 407 (5) | 413 (4) | 403 (4)a |
Sleep efficiency, % (SD) | 77.3 (0.8) | 76.9 (0.7) | 76.1 (0.6) |
Sleep latency, minutes (SD) | 41.4 (2.7) | 43.5 (2.2) | 44.7 (2.2) |
Wake after sleep onset, minutes (SD) | 76.0 (3.3) | 79.1 (2.7) | 82.1 (2.7)b |
Long wake episodes, # (SD) | 6.5 (0.2) | 6.9 (0.2)b | 7.1 (0.2)c |
Napping, minutes (SD) | 77.1 (4.5) | 80.0 (3.7) | 80.5 (3.6) |