Prevalence of secondhand smoke (SHS) exposure (cotinine levels ⩾0.05 ng/ml) among non-smoking adults by selected characteristics
| Characteristics | n | Percentage with measured SHS exposure† (95% CI) |
|---|---|---|
| *p<0.05. | ||
| †Cotinine levels ⩾LOD (0.05 ng/ml). | ||
| ‡Self-reported. | ||
| §Referent category used to test the null hypothesis of no difference in proportions using the t test. | ||
| Total | 5866 | 39.1 (35.2 to 43.1) |
| Smoke-free law coverage | ||
| No law§ | 4026 | 45.9 (42.4 to 49.4) |
| Limited | 503 | 35.1 (24.0 to 48.0) |
| Extensive | 1337 | 12.5 (8.5 to 18.0)* |
| Workplace SHS exposure‡ | ||
| Yes | 436 | 66.5 (58.2 to 73.9)* |
| No | 5428 | 36.5 (32.8 to 40.3) |
| Restaurant meals/week | ||
| 0 to 3 | 4670 | 36.1 (32.2 to 40.2)* |
| 4+ | 1194 | 47.5 (42.1 to 53.1) |
| Sex | ||
| Men | 2503 | 45.4 (40.3 to 50.5)* |
| Women | 3363 | 34.2 (30.7 to 37.9) |
| Race/ethnicity | ||
| Non-Hispanic white§ | 2940 | 35.4 (30.8 to 40.4) |
| Non-Hispanic black | 908 | 63.8 (58.8 to 68.5) * |
| Mexican American | 1534 | 37.5 (32.9 to 42.4) |
| Age group | ||
| 20–39 years | 1949 | 45.6 (40.2 to 51.1)* |
| 40–59 years | 1629 | 37.6 (33.2 to 42.1)* |
| 60+ years§ | 2288 | 32.6 (28.9 to 36.5) |
| Education | ||
| ⩽12 years | 3061 | 47.2 (43.6 to 50.8)* |
| >12 years | 2795 | 33.6 (29.6 to 37.9) |