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Shift work, nitrous oxide exposure, and spontaneous abortion among Swedish midwives

Journal article
Authors Gösta Axelsson
Gunnar Ahlborg
L. Bodin
Published in Occupational and Environmental Medicine
Volume 53
Issue 6
Pages 374-8
ISSN 1351-0711
Publication year 1996
Published at Institute of Internal Medicine, Dept of Medicine
Pages 374-8
Language en
Keywords Abortion, Spontaneous/*chemically induced, Adult, Female, Humans, Middle Aged, *Midwifery, Nitrous Oxide/administration & dosage/*adverse effects, Occupational Diseases/*chemically induced, Occupational Exposure/*adverse effects, *Personnel Staffing and Scheduling, Pregnancy, Risk Factors, Sweden, Workload
Subject categories Public Administration Studies, Occupational medicine, Public health medicine research areas, Toxicology


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. RESULTS: 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.

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