Table 2

Adjusted odds ratios of preterm birth related to working conditions in three subgroups of countries

Countries–A1Countries–A2Countries–B
infant mortality rate <8 per thousandinfant mortality rate >10 per thousand
frequent long prenatal leavesnon-frequent long prenatal leavesfrequent long prenatal leaves
adj OR* (95% CI)adj OR* (95% CI)adj OR* (95% CI)
Countries–A1: France, Germany, Italy, Slovenia, the Czech Republic. Countries–A2: Finland, Greece, Ireland, Scotland, Spain, Sweden, the Netherlands. Countries–B: Hungary, Poland, Romania, Russia. *Adjusted for age, educational level, marital status, obstetrical history, and country. One model was calculated for each of the variables describing working conditions.
Number of employed women 1833 term births 1600 term births 616 term births
after the third month of pregnancy 936 preterm births 859 preterm births 534 preterm births
Occupational groups (ILO code)
Professionals or managers (1+2)111
Associate professionals (3)0.98(0.7 to 1.3)0.78(0.6 to 1.1)1.43(0.9 to 2.2)
Clerks (4)0.95(0.7 to 1.3)0.84(0.6 to 1.1)1.20(0.7 to 1.9)
Services and sales workers (5+0)1.18(0.9 to 1.6)0.76(0.6 to 1.0)1.54(0.9 to 2.5)
Craft and related trades workers (7)1.03(0.7 to 1.5)0.93(0.6 to 1.5)1.00(0.6 to 1.7)
Other manual workers (6+8+9)1.39(1.0 to 2.0)1.33(0.9 to 1.9)1.49(0.9 to 2.5)
Weekly working hours
less than 301.00(0.8 to 1.3)1.04(0.8 to 1.4)1.38(0.9 to 2.2)
30–39111
40–420.85(0.7 to 1.1)1.20(0.9 to 1.5)1.43(1.0 to 2.1)
43 or more1.12(0.8 to 1.5)1.40(1.0 to 1.9)1.65(1.0 to 2.7)
Standing position
less than 2 h111
2–6 h0.98(0.8 to 1.2)1.09(0.9 to 1.4)1.15(0.8 to 1.6)
more than 6 h1.06(0.8 to 1.3)1.38(1.1 to 1.7)1.55(1.1 to 2.3)
Work with a visual display unit
No111
less than 50% time0.86(0.7 to 1.1)1.07(0.8 to 1.4)0.86(0.5 to 1.4)
more than 50% time0.89(0.7 to 1.1)0.81(0.6 to 1.0)0.92(0.6 to 1.4)
Autonomy in the work
No1.14(0.9 to 1.4)1.18(1.0 to 1.4)0.94(0.7 to 1.2)
Satisfaction with the job
very satisfied111
satisfied1.02(0.8 to 1.2)0.98(0.8 to 1.2)0.95(0.7 to 1.2)
not satisfied1.42(1.1 to 1.8)1.10(0.8 to 1.4)1.28(0.8 to 1.9)