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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.