Characteristics of the 1063 children of the PARIS cohort included in the pollen and air pollution cluster analysis, compared with those not included
| Non included n=2777 | Included n=1063 | P value* | |
| Sex | 0.29 | ||
| Male | 1410 (50.8) | 560 (52.7) | |
| Female | 1367 (49.2) | 503 (47.3) | |
| Family socioeconomic status | <0.001 | ||
| High | 1681 (60.5) | 713 (67.1) | |
| Medium | 799 (28.8) | 281 (26.4) | |
| Low | 297 (10.7) | 69 (6.5) | |
| Older siblings | 0.05 | ||
| None | 1604 (57.8) | 575 (54.1) | |
| One | 911 (32.8) | 365 (34.3) | |
| Two or more | 262 (9.4) | 123 (11.6) | |
| Place of residence at birth | 0.34 | ||
| Paris city | 1772 (63.8) | 661 (62.2) | |
| Paris suburbs | 1005 (36.2) | 402 (37.8) | |
| Maternal age at birth >35 years | 637 (22.9) | 308 (29.0) | <0.001 |
| Parental history of asthma | 553 (20.0) | 211 (19.9) | 0.96 |
| Parental history of asthma, allergic rhinitis or eczema | 1452 (52.3) | 576 (54.2) | 0.29 |
| Maternal smoking during pregnancy | 331 (11.9) | 102 (9.6) | 0.04 |
| Exposure to ETS at home at birth | 573 (21.5) | 224 (21.4) | 0.89 |
All data are n (%). Bold p values were used to highlight significant associations (p<0.05).
*χ2 test.
ETS, environmental tobacco smoke.