No foetal exposure | Foetal exposure to tobacco smoking | ||||||
---|---|---|---|---|---|---|---|
n/N1 | % | 95% CI | n/N1 | % | 95% CI | p-value2 | |
Gender (male) | 1676/3321 | 51 | 49 – 52 | 242/469 | 52 | 47 – 56 | 0.646 |
Parental asthma | 533/3302 | 16 | 15 – 17 | 73/457 | 16 | 13 – 19 | 0.927 |
Birth weight <2500 g | 121/3321 | 3.6 | 3.0 – 4.3 | 19/469 | 4.1 | 2.5 – 6.3 | 0.661 |
Gestational age <36 w | 102/3321 | 3.1 | 2.5 – 3.7 | 15/469 | 3.2 | 1.8 – 5.2 | 0.946 |
Exclusive breastfeeding ≥4 months | 2690/3316 | 81 | 80 – 82 | 323/469 | 69 | 65 – 73 | <0.001 |
Maternal age ≥26 years | 3091/3320 | 93 | 92 – 94 | 413/469 | 88 | 85 – 95 | <0.001 |
Socioeconomic index (SEI)3 | |||||||
1) Blue-collar | 482/3311 | 15 | 13 – 16 | 140/468 | 30 | 26 – 34 | <0.001 |
2) White collar | 2792/3311 | 84 | 83 – 86 | 323/468 | 69 | 62 – 71 | <0.001 |
3) Others4 | 37/3311 | 1.1 | 0.8 – 1.5 | 5/468 | 1.1 | 0.1 – 2.0 | 0.924 |
Keeping of cat and/or dog | 426/3321 | 13 | 12 – 14 | 121/469 | 26 | 22 – 30 | <0.001 |
Signs of dampness5 | 267/3309 | 8.1 | 7.1 – 9.0 | 39/468 | 8.3 | 5.8 – 11 | 0.844 |
Construction year of the home >1961 | 1679/3319 | 49 | 48 – 51 | 266/468 | 57 | 52 – 61 | 0.003 |