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Table 1 Characteristics of the solvent exposed and unexposed study groups, and the source population

From: Congenital anomalies in newborns to women employed in jobs with frequent exposure to organic solvents - a register-based prospective study

  Population1,2 Exposed1 Unexposed1
Number of observations 26 415 712 10 561
Births with maternal age <18 years (%) 2.1 1.1 2.6
Maternal alcohol abuse in pregnancy (%) 0.5 0.7 0.3
Maternal tobacco smoking in pregnancy (%) 1.9 1.7 1.3
Maternal malformation (%) 1.2 1.0 1.4
Maternal diabetes mellitus 0.1 0.0 0.1
Mean first antenatal visit in weeks (SD)3 14.2 (7.9) 14.1 (7.6) 13.6 (7.1)
Primiparous births (%) 52.4 48.3 46.8
Stillborn (%) 1.0 1.1 0.8
Mean maternal age in years (SD)3 25.2 (5.1) 24.3 (4.6) 25.1 (5.1)
  1. 1 More than one birth per woman included. 2 All singleton births in the source population. 3 SD = standard deviation