Table 2 Agreement between questionnaire reported smoking during the AIRALLERG measurement period and questionnaire reported smoking from the cohort questionnaires at age 4 years.
| AIRALLERG measurement period | Questionnaire at age 4 years | |||||
|---|---|---|---|---|---|---|
| Germany | Netherlands | Sweden | ||||
| No, n (%) | Yes, n (%) | No, n (%) | Yes, n (%) | No, n (%) | Yes, n (%) | |
| Any smoking | ||||||
| No | 251 (87.2%) | 37 (12.8%) | 231 (95.1%) | 12 (4.9%) | NA | NA |
| Yes | 8 (23.5%) | 26 (76.5%) | 44 (53.0%) | 39 (47.0%) | NA | NA |
| Smoking by household members | ||||||
| No | NA | NA | 268 (94.4%) | 16 (5.6%) | 276 (81.7%) | 62 (18.3%) |
| Yes | NA | NA | 5 (12.5%) | 35 (87.5%) | 2 (33.3%) | 4 (66.7%) |
| Smoking by others | ||||||
| No | NA | NA | 254 (95.8%) | 11 (4.2%) | NA | NA |
| Yes | NA | NA | 49 (83.1%) | 10 (16.9%) | NA | NA |
NA, not available.