Objectives-To study the relation between irregular work hours, nitrous oxide (N2O) exposure, and the risk of spontaneous abortion.
Methods-All 3985 female members of the Swedish Midwives Association in 1989, born in 1940 or later, received a questionnaire on exposure before and during all of their pregnancies.
Questions on work conditions covered occupation, extent of employment, workplace, work schedules, use of anaesthetics, and work load.
The association between exposure variables and spontaneous abortion was analysed by logistic regression models.
Night work and three shift schedules among midwives showed increased odds ratios (ORs) (95% confidence intervals (95% CI)) 1.63 (0.95-2.81) and 1.49 (0.86-2.59), respectively.
The ORs of late spontaneous abortions (after the 12th week of pregnancy) was increased for night work 3.33 (1.13-9.87).
Use of N2O (>50% of the deliveries) was not associated with increased risk of spontaneous abortion OR 0.95 (0.62-1.47).
Frequent or permanent shortage of staff was related to an increased risk of spontaneous abortions before the 13th week of pregnancy.
Conclusions-The results support the hypothesis that night work and high work load increase the risk of spontaneous abortion.
Mots-clés Pascal : Avortement, Spontané, Epidémiologie, Femme, Homme, Azote protoxyde, Travail posté, Rythme travail, Charge travail, Sage femme, Exposition professionnelle, Médecine travail, Suède, Europe, Gestation pathologie, Personnel sanitaire
Mots-clés Pascal anglais : Abortion, Spontaneous, Epidemiology, Woman, Human, Nitrogen protoxide, Shift work, Working rhythm, Workload, Midwife, Occupational exposure, Occupational medicine, Sweden, Europe, Pregnancy disorders, Health staff
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0295637
Code Inist : 002B20F02. Création : 199608.