Sleep disturbances at baseline among women in SWAN included in the primary cohort
| No sleep medication n=447 | Sleep medication user n=238 | SMD | |
| Trouble initiating sleep, mean (95% CI)* | 2.6 (2.5 to 2.7) | 2.7 (2.5 to 2.9) | 0.08 |
| Waking frequently, mean (95% CI)* | 3.7 (3.6 to 3.9) | 3.8 (3.6 to 3.9) | 0.03 |
| Early morning awakening, mean (95% CI)* | 2.7 (2.6 to 2.8) | 2.8 (2.6 to 3.0) | 0.07 |
| Trouble initiating sleep, at least three nights per week, n (%) | 137 (30.7) | 82 (34.5) | 0.07 |
| Waking frequently, at least three nights per week, n (%) | 291 (65.1) | 158 (66.4) | 0.008 |
| Early morning awakening, at least three nights per week, n (%) | 135 (30.2) | 81 (34.0) | 0.07 |
| Any disturbance, at least three nights per week, n (%) | 322 (72.0) | 183 (76.9) | 0.08 |
*Mean calculated based on 5-point Likert scale, where 1=no difficulties on any nights, 2=difficulties on less than one night per week, 3=one to two nights per week, 4=three to four nights per week and 5=five to seven nights per week.
SMD, standardised mean difference; SWAN, Study of Women’s Health Across the Nation.