Table 1. Characteristics of the study sample according to the frequency of possible sleep bruxism.
| Variables | Total sample ( n = 2,059) |
Sleep bruxism ( n = 507; 20,4%) |
||
|---|---|---|---|---|
| N | % | 95% confidence interval | % (95% confidence interval) | |
| Sex a (n = 2,050) | ||||
| Male | 983 | 47.9 | 45.8–50.1 | 22.4 (19.8–24.9) |
| Female | 1,067 | 52.1 | 49.9–54.2 | 26.7 (24.1–29.4) |
| Age in years a (n = 2,050) | ||||
| 16–17 | 310 | 15.1 | 13.6–16.7 | 26.4 (21.5–31.4) |
| 18–24 | 1,352 | 65.9 | 63.9–68.0 | 22.6 (20.4–24.9) |
| 25–34 | 214 | 10.4 | 9.1–11.8 | 23.8 (18.1–29.6) |
| ≥ 35 | 174 | 8.5 | 7.3–9.7 | 37.4 (30.1–44.6) |
| Paid employment a (n = 2,053) | ||||
| No | 1,584 | 77.2 | 75.3–79.0 | 23.5 (21.5–25.6) |
| Yes | 469 | 22.8 | 21.0–24.7 | 28.4 (24.3–32.5) |
| Family income (US$, February 2022; n = 1,695) | ||||
| 0–309 | 272 | 16.1 | 14.3–17.8 | 24.6 (19.5–29.8) |
| 310–1,548 | 1,043 | 61.5 | 59.2–63.8 | 24.7 (22.1–27.4) |
| ≥ 1,549 | 380 | 22.4 | 20.4–24.4 | 26.3 (21.9–30.8) |
| Stress level a (n = 2,034) | ||||
| Low (score ≤ 14) | 1,087 | 53.4 | 51.3–55.6 | 21.3 (18.9–23.8) |
| High (score > 14) | 947 | 46.6 | 44.4–48.7 | 28.6 (25.7–31.5) |
| Stress level (score in quintiles) a (n = 2,034) | ||||
| 1 st | 417 | 20.5 | 18.7–22.3 | 21.8 (17.8–25.8) |
| 2 sd | 436 | 21.5 | 19.6–23.2 | 19.5 (15.8–23.2) |
| 3 rd | 456 | 22.4 | 20.6–24.2 | 24.1 (20.2–28.1) |
| 4 th | 334 | 16.4 | 14.8–18.0 | 27.8 (23.0–36.7) |
| 5 th | 391 | 19.2 | 17.5–20.9 | 31.7 (27.1–36.3) |
| Depressive symptoms a (n = 2,034) | ||||
| No | 1,703 | 83.4 | 81.8–85.0 | 23.7 (21.7–25.7) |
| Yes | 338 | 16.6 | 14.9–18.2 | 29.3 (24.4–34.2) |
Note: a Chi-squared and Fisher exact tests; p -value < 0.05.