Crude HR | 95% CI | Adjusted HR* | 95% CI | |
Maternal age | 0.94 | 0.92 to 0.96 | 0.93 | 0.91 to 0.95 |
Gestational age | 1.00 | 0.99 to 1.01 | 1.00 | 0.99 to 1.01 |
Birth weight | 0.99 | 0.98 to 1.01 | 1.00 | 0.99 to 1.02 |
Parity | ||||
1 | Ref | Ref | ||
2 | 0.98 | 0.94 to 1.03 | 1.04 | 0.99 to 1.08 |
≥3 | 0.99 | 0.94 to 1.04 | 1.06 | 1.00 to 1.13 |
Maternal social status | ||||
Not in labour market | 1.03 | 0.98 to 1.09 | 1.01 | 0.95 to 1.06 |
Unskilled workers | 1.14 | 1.04 to 1.26 | 1.17 | 1.06 to 1.29 |
Skilled workers and white-collar workers | 1.08 | 1.03 to 1.13 | 1.06 | 1.02 to 1.11 |
Top level status | Ref | Ref | ||
Residence | ||||
Capital or capital suburb | 1.06 | 1.02 to 1.11 | 1.07 | 1.02 to 1.12 |
Provincial city or town | 0.93 | 0.88 to 0.99 | 0.95 | 0.89 to 1.00 |
Rural areas | Ref | Ref | ||
Maternal smoking during pregnancy | 1.13 | 1.08 to 1.17 | 1.13 | 1.08 to 1.18 |
Maternal history of asthma | 0.79 | 0.73 to 0.85 | 0.79 | 0.73 to 0.85 |
Sex | ||||
Male | Ref | Ref | ||
Female | 1.18 | 1.14 to 1.23 | 1.18 | 1.13 to 1.22 |
Mode of delivery | ||||
Delivered vaginally | Ref | Ref | ||
Delivered by caesarean section | 0.95 | 0.89 to 1.02 | 0.98 | 0.92 to 1.05 |
Age of asthma onset | 1.10 | 1.09 to 1.11 | 1.10 | 1.09 to 1.11 |
*Cox proportional hazards regression model (HR, 95% CI) adjusting for maternal age at delivery; maternal parity; maternal socio-economic status at delivery; maternal smoking status during pregnancy; maternal history of asthma; sex of the child; gestational weeks at delivery; maternal residence at delivery; birth weight, delivery method and age of asthma onset.