Table 1. Prevalence ratios (PRs) and 95% confidence intervals for dental caries in relation to study variables (unadjusted analysis).
| Prevalence | Crude PR (95% CI) | |
| Sex | ||
| Female | 184/969 (19.0%) | 1.00 |
| Male | 241/1087 (22.2%) | 1.17 (0.98–1.39) |
| Toothbrushing frequency (times/day) | ||
| <2 | 252/1244 (20.3%) | 1.00 |
| ≥2 | 173/812 (21.3%) | 1.05 (0.89–1.25) |
| Use of fluoride | ||
| No | 54/318 (17.0%) | 1.00 |
| Yes | 371/1738 (21.4%) | 1.26 (0.97–1.63) |
| Regular dental check-ups | ||
| No | 301/1166 (25.8%) | 1.00 |
| Yes | 124/890 (13.9%) | 0.54 (0.45–0.65) |
| Between-meal snack frequency (times/day) | ||
| <1 | 78/444 (17.6%) | 1.00 |
| 1 | 128/754 (17.0%) | 0.97 (0.75–1.25) |
| ≥2 | 219/858 (25.5%) | 1.45 (1.15–1.83) |
| Maternal smoking during pregnancy | ||
| No | 346/1787 (19.4%) | 1.00 |
| Yes | 79/269 (29.4%) | 1.52 (1.23–1.87) |
| ETS exposure at home | ||
| No | 205/1156 (17.7%) | 1.00 |
| Yes | 220/900 (24.4%) | 1.38 (1.16–1.63) |
| Paternal educational level (years) | ||
| <13 | 145/565 (25.7%) | 1.00 |
| 13–14 | 63/307 (20.5%) | 0.80 (0.62–1.04) |
| ≥15 | 217/1184 (18.3%) | 0.71 (0.59–0.86) |
| Maternal educational level (years) | ||
| <13 | 166/581 (28.6%) | 1.00 |
| 13–14 | 151/823 (18.4%) | 0.64 (0.53–0.78) |
| ≥15 | 108/652 (16.6%) | 0.58 (0.47–0.72) |
ETS, environmental tobacco smoke.