Linear regression models fitted on log cotinine:creatinine ratios
| Regression models [no. of households]* | B (regression coefficient) (95% CI) | Βeta (standardised regression coefficient) | t statistic | p value | Variance (R2) explained by each additional variable |
|---|---|---|---|---|---|
| *Numbers of households vary due to missing data. | |||||
| Model 1 [n = 174] | |||||
| Home smoking ban (yes v no) | −0.76 (−1.17 to −0.35) | −0.27 | −3.62 | <0.001 | (0.071) 7.1% |
| −0.59 (−0.94 to −0.24) | −0.21 | −3.35 | 0.001 | ||
| Model 2 [n = 168] | |||||
| Home smoking ban (yes v no) | 0.61 (0.47 to 0.75) | 0.54 | 8.62 | <0.001 | (0.287) 28.7% |
| Mother’s average daily cigarette consumption | −0.58 (−0.93 to −0.22) | −0.20 | −3.23 | 0.001 | |
| Model 3 [n = 165] | |||||
| Home smoking ban (yes v no) | 0.62 (0.48 to 0.77) | 0.55 | 8.60 | <0.001 | (0.008) 0.8% |
| Mother’s average daily cigarette consumption | 0.15 (0.02 to 0.28) | 0.14 | 2.23 | 0.017 | |
| Partner’s average daily cigarette consumption | −0.52 (−0.86 to −0.18) | −0.18 | −3.05 | 0.003 | |
| Model 4 [n = 165] | |||||
| Home smoking ban (yes v no) | 0.55 (0.40 to 0.69) | 0.48 | 7.65 | <0.001 | (0.062) 6.2% |
| Mother’s average daily cigarette consumption | 0.18 (0.05 to 0.30) | 0.17 | 2.80 | 0.006 | |
| Partner’s average daily cigarette consumption | 0.74 (0.39 to 1.09) | 0.26 | 4.19 | <0.001 | (0.005) 0.5% |
| Housing tenure | −0.55 (−0.89 to −0.20) | −0.19 | −3.12 | 0.002 | |
| Model 5 [n = 159] | |||||
| Home smoking ban (yes v no) | 0.57 (0.42 to 0.72) | 0.48 | 7.60 | <0.001 | |
| Mother’s average daily cigarette consumption | 0.17 (0.05 to 0.30) | 0.16 | 2.68 | 0.008 | |
| Partner’s average daily cigarette consumption | 0.71 (0.34 to 1.07) | 0.25 | <0.001 | ||
| Housing tenure | −0.17 (−0.53 to 0.20) | −0.06 | −0.95 | 0.349 | |
| Overcrowding | |||||