Table 2.
Prevalence of Insomnia Symptoms [% (95% CI)] by Sex, Age in Participants Without Pain Causing Sleep Disruptiona
| No DIMS | ≥1 Acute DIMS | ≥1 Chronic DIMS | p | |||
|---|---|---|---|---|---|---|
| ± Daytime problems | ± Daytime problems | No daytime symptoms | ≥ 1 Chronic daytime symptom | ≥ 1 Chronic daytime symptom | ||
| + TIB <7.5hr | + TIB ≥7.5hr (Insomnia) | |||||
| Overall, n | 791 | 165 | 227 | 147 | 402 | |
| % (95% CI) | 45.6 (43.3–48.0) | 9.5 (8.2–11.0) | 13.1 (11.6–14.7) | 8.6 (7.3–10.0) | 23.2 (21.2–25.2) | |
| Sex | ||||||
| Males, n | 401 | 65 | 134 | 66 | 178 | <0.001 |
| % (95% CI) | 47.5 (44.2–50.9) | 7.7 (6.0–9.6) | 15.9 (13.5–18.5) | 7.8 (6.2–9.8) | 21.1 (18.4–23.9) | |
| Females, n | 390 | 100 | 93 | 81 | 224 | |
| % (95% CI) | 43.9 (40.7–47.2) | 11.3 (9.3–13.5) | 10.5 (8.6–12.6) | 9.1 (7.4–11.1) | 25.2 (22.5–28.2) | |
| Males | ||||||
| Age <55y | 48.8 (43.8–53.8) | 12.3 (9.3–15.9) | 10.0 (7.3–13.3) | 9.2 (6.6–12.4) | 19.7 (15.9–23.9) | <0.001 |
| Age ≥55y | 46.4 (41.9–51.0) | 3.9 (2.4–5.9) | 20.7 (17.2–24.6) | 6.7 (4.7–9.2) | 22.2 (18.6–26.2) | |
| Females | ||||||
| Age <55y | 43.1 (39.7–46.7) | 12.3 (10.1–14.8) | 9.4 (7.5–11.6) | 8.8 (6.9–10.9) | 26.4 (23.4–29.6) | 0.003 |
| Age ≥55y | 48.8 (40.1–57.6) | 4.9 (2.1–9.8) | 17.1 (11.2–24.4) | 11.4 (6.7–17.9) | 17.9 (11.9–25.4) | |
Notes: aAnalysis conducted in n=1732 participants without pain causing sleep disruption on four or more nights per week. Chi2 p-value for distribution across insomnia categories for males vs females within age <55 years p=0.15, within age ≥55 y p=0.33.
Abbreviations: DIMS, difficulties initiating or maintaining sleep; TIB, time in bed on work or weekdays.