Number of current household smokers and lung function level, percentage change, and 95% confidence intervals (95% CI), Children's Health Study, 1993 (n = 3357)
| No. of household smokers |
Unadjusted for in utero exposure % change (95% CI) |
Adjusted for in utero exposure % change (95% CI) |
| FEV1 | ||
| 0 | – | – |
| 1 | −0.6 (−1.7 to 0.6) | −0.3 (−1.5 to 1.0) |
| 2+ | −0.1 (−1.8 to 1.5) | 0.4 (−1.4 to 2.2) |
| FVC | ||
| 0 | – | – |
| 1 | −0.1 (−1.2 to 1.0) | −0.2 (−1.4 to 0.9) |
| 2+ | 1.0 (−0.5 to 2.6) | 0.7 (−0.9 to 2.4) |
| PEFR | ||
| 0 | – | – |
| 1 | −2.7 (−4.3 to −1.0) | −2.0 (−3.7 to −0.2) |
| 2+ | −2.1 (−4.4 to 0.3) | −0.9 (−3.4 to 1.7) |
| MMEF | ||
| 0 | – | – |
| 1 | −2.1 (−4.7 to 0.5) | −0.9 (−3.6 to 1.9) |
| 2+ | −4.1 (−7.6 to −0.4) | −2.0 (−5.8 to 1.9) |
| FEF75 | ||
| 0 | – | – |
| 1 | −0.2 (−5.2 to 1.8) | −0.02 (−3.6 to 3.8) |
| 2+ | −4.4 (−9.1 to −0.4) | −1.4 (−6.4 to 3.8) |
Models are adjusted for community, grade, spirometer, technician, log (height), age, sex, race, weight and weight2, two way interactions of sex and grade with age, race, log (height), weight and weight2, and selected medical and household characteristics.
For definitions see table 3.