Association between amount currently smoked by the parents and symptoms of asthma, eczema and rhinoconjunctivitis at 6–7 years of age
| Symptom | Current paternal smoking | Current maternal smoking | ||||
| 1–9 cigarettes | 10–19 cigarettes | 20+ cigarettes | 1–9 cigarettes | 10–19 cigarettes | 20+ cigarettes | |
| Current wheeze | 1.06 (1.00 to 1.12) | 1.15 (1.08 to 1.22) | 1.27 (1.19 to 1.35) | 1.25 (1.17 to 1.34) | 1.29 (1.20 to 1.38) | 1.44 (1.31 to 1.59) |
| Severe asthma symptoms | 1.05 (0.96 to 1.15) | 1.22 (1.12 to 1.34) | 1.42 (1.30 to 1.56) | 1.27 (1.15 to 1.40) | 1.35 (1.22 to 1.50) | 1.56 (1.36 to 1.80) |
| Asthma ever | 1.03 (0.97 to 1.10) | 1.11 (1.04 to 1.18) | 1.18 (1.11 to 1.26) | 1.18 (1.09 to 1.27) | 1.29 (1.20 to 1.40) | 1.37 (1.24 to 1.52) |
| Current eczema symptoms | 1.08 (1.02 to 1.15) | 1.04 (0.97 to 1.11) | 1.11 (1.04 to 1.20) | 1.17 (1.08 to 1.26) | 1.13 (1.04 to 1.23) | 1.15 (1.02 to 1.30) |
| Current rhinoconjunctivitis symptoms | 1.04 (0.98 to 1.11) | 1.06 (0.99 to 1.13) | 1.10 (1.03 to 1.18) | 1.18 (1.09 to 1.27) | 1.02 (0.94 to 1.11) | 1.14 (1.02 to 1.28) |
| Eczema symptoms without wheeze | 1.08 (1.01 to 1.16) | 1.01 (0.94 to 1.09) | 1.02 (0.94 to 1.11) | 1.07 (0.98 to 1.17) | 1.11 (1.00 to 1.22) | 1.08 (0.94 to 1.25) |
| Rhinoconjunctivitis symptoms without wheeze | 1.04 (0.97 to 1.12) | 0.98 (0.91 to 1.07) | 1.00 (0.92 to 1.09) | 1.07 (0.98 to 1.17) | 0.92 (0.82 to 1.03) | 1.05 (0.90 to 1.21) |
Data are OR (95% CI) and are adjusted for gender, language, region and GNI category. Reference group is 0 cigarettes per day.