Table 1

 Characteristics of laboratory technicians (exposed) and teachers (unexposed)

Laboratory techniciansTeachers
n%n%
*Among women with previous pregnancies.
†One unit of alcohol equals one glass of wine or one bottle of beer (12 g alcohol).
Total1025100.08037100.0
Maternal age, years
    <3053151.8380147.3
    30–3439538.5306438.1
    35+999.7117214.6
Gravidity
    039638.6289136.0
    1+62961.4514364.0
    Missing00.030.0
History of spontaneous abortion*
    Yes17427.7152229.6
    No45572.3361870.3
    Missing00.030.1
Smoking
    Yes15314.9177322.1
    No87285.1626077.9
    Missing00.040.0
Alcohol consumption (units per week)†
    No51250.0444655.3
    0.5–136035.1246630.7
    >115314.9111913.9
    Missing00.060.1
Prepregnancy body mass index (kg/m2)
    <18.5434.22132.7
    18.5–3090388.1707288.0
    >30676.56297.8
    Missing121.21231.5
Paternal job
    Laboratory656.31732.2
    Non-laboratory78176.2681684.8
    No job545.36848.5
    Missing12512.23644.5