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Table 1 Demographic and pregnancy related details for the study population (n = 110,381)

From: Pollen exposure in pregnancy and infancy and risk of asthma hospitalisation - a register based cohort study

Maternal smoking during pregnancy*

None smoker

75.7%

 

1–9 cigarettes/day

10.5%

 

≥10 cigarettes/day

6.4%

Parity

1st born

47.7%

 

2nd born

34.6%

 

3rd born

12.6%

 

4th or subsequent

5.1%

Birth details

  

Proportion of females

 

48.8%

Median (IQR**) gestational age (in weeks) at delivery

 

40 (39–41)

Median (IQR**) birth weight in kg

 

3.5 (3.2-3.8)

Child outcomes

  

Proportion of children ever hospitalised for asthma

 

0.85%

  1. * Details on smoking history missing for 7.3% of mothers.
  2. ** IQR – inter-quartile range.