Table 1 Questionnaire reported indoor smoking during the measurement period and in the 24 hours prior to urine sampling, and other study home characteristics.
| Germany | Netherlands | Sweden | |
|---|---|---|---|
| n/N (%) | n/N (%) | n/N (%) | |
| Measurement period | |||
| Smoking reported for | |||
| None | 307/347 (88.5) | 249/333 (74.8) | 345/356 (96.9) |
| Household members only | 24/347 (6.9) | 41/333 (12.3) | 8/356 (2.3) |
| Household members and others | 12/347 (3.5) | 24/333 (7.2) | 1/356 (0.3) |
| Others only | 4/347 (1.2) | 19/333 (5.7) | 2/356 (0.6) |
| Frequency/amount of smoking | |||
| None | 307/347 (88.5) | 249/335 (74.3) | 345/356 (96.9) |
| Occasionally | 13/347 (3.7) | 53/335 (15.8) | 9/356 (2.5) |
| ⩽5 cigarettes daily | 14/347 (4.0) | 8/335 (2.4) | 1/356 (0.3) |
| >5 cigarettes daily | 13/347 (3.7) | 25/335 (7.5) | 1/356 (0.3) |
| Amount of smoking | |||
| As usual | 331/347 (95.4) | 298/332 (89.7) | 354/356 (99.4) |
| More than usual | 8/347 (2.3) | 32/332 (9.6) | 1/356 (0.3) |
| Less than usual | 8/347 (2.3) | 2/332 (0.6) | 1/356 (0.3) |
| Mechanical ventilation used | 10/347 (2.9) | 110/331 (33.2) | 60/353 (17.0) |
| Windows open frequently | 233/347 (67.1) | 174/333 (52.3) | 100/353 (28.3) |
| Housing characteristics | |||
| Open kitchen | 78/346 (22.5) | 239/335 (71.3) | 88/353 (24.9) |
| Living room volume (m3) (median (IQR)) | 68 (55–86) | 94 (76–124) | 55 (47–74) |
| 24 hours before urine sampling | |||
| Amount of smoking | NA | NA | |
| 0 cigarettes | 269/307 (87.6) | ||
| 1–5 cigarettes | 16/307 (5.2) | ||
| >5 cigarettes | 22/307 (7.2) | ||
| At child's age 4 years | |||
| Any smoking in at home* | 63/322 (19.6) | 48/323 (14.9) | 68/349 (19.5) |
*BAMSE at present by household members; GINI, during past 12 months by household members and/or other persons; LISA, during past two years by household members and/or other persons; PIAMA, at present by household members and/or other persons.
NA, not available.