ORs and 95% CIs from logistic regression models examining associations of year of data collection and SES with exposure to smoke in private spaces
| Smoking allowed in cars (yes vs no) | Smoking in car yesterday | Smoking restriction in the home (base category=full restriction) | Smoking in home yesterday | Parent figures smoke in the home | ||||
|---|---|---|---|---|---|---|---|---|
| Partial | No restriction | Father only | Mother only | Both parents | ||||
| All children | ||||||||
| n | 2407 | 2987 | 2664 | 2955 | 2836 | |||
| Model 1 | ||||||||
| Year (reference=2008) | 0.42 (0.33 to 0.54) | 0.52 (0.38 to 0.72) | 0.70 (0.59 to 0.83) | 0.30 (0.20 to 0.43) | 0.44 (0.36 to 0.53) | 0.54 (0.42 to 0.70) | 0.48 (0.36 to 0.64) | 0.65 (0.49 to 0.86) |
| FAS | 0.74 (0.68 to 0.80) | 0.92 (0.83 to 1.02) | 0.77 (0.72 to 0.83) | 0.63 (0.57 to 0.71) | 0.70 (0.65 to 0.75) | 0.73 (0.67 to 0.81) | 0.72 (0.65 to 0.79) | 0.67 (0.62 to 0.73) |
| Model 2 | ||||||||
| FAS*year | 1.14 (0.95 to 1.37) | 1.28 (1.01 to 1.60) | 1.00 (0.88 to 1.14) | 1.05 (0.80 to 1.38) | 1.06 (0.91 to 1.22) | 0.94 (0.78 to 1.15) | 1.06 (0.84 to 1.34) | 1.05 (0.86 to 1.29) |
| Children with at least one parent figure who smokes | ||||||||
| n | 982 | 1303 | 1149 | 1303 | 1217 | |||
| Year (reference=2008) | 0.41 (0.31 to 0.53) | 0.49 (0.35 to 0.69) | 0.59 (0.48 to 0.73) | 0.26 (0.17 to 0.39) | 0.41 (0.33 to 0.51) | 0.45 (0.33 to 0.60) | 0.38 (0.28 to 0.53) | 0.52 (0.38 to 0.70) |
| FAS | 0.87 (0.79 to 0.97) | 1.07 (0.96 to 1.20) | 0.82 (0.75 to 0.88) | 0.70 (0.61 to 0.80) | 0.80 (0.75 to 0.87) | 0.88 (0.78 to 0.98) | 0.86 (0.77 to 0.95) | 0.79 (0.71 to 0.88) |
All models adjusted for age and include random terms for school. Significant ORs highlighted in bold.
FAS, Family Affluence Scale; SES, secondhand smoke.