title: Is preterm delivery still related to physical working conditions in pregnancy?
abstract: OBJECTIVE
  The aim was to determine the relationship between working conditions during pregnancy, women's occupation, and preterm birth.
  
  
  METHODS
  This was a retrospective survey.
  
  
  METHODS
  The study was carried out in four public maternity units in France in 1987 and 1988.
  
  
  METHODS
  1949 women were interviewed after the delivery during their stay in hospital. Of these, 1002 held a job during pregnancy, but this report is confined to 875 women who had a single live birth and who had worked for more than the first trimester of pregnancy.
  
  
  RESULTS
  Information about social and occupational status was obtained through interviews, and data about gestational length were obtained from medical records. The primary results showed that preterm birth did not vary significantly according to working conditions whereas it differed according to occupational group.
  
  
  CONCLUSIONS
  Occupation, but not working conditions, affected the incidence of preterm birth. This result is discordant with other studies which underlined the excess of preterm births among women with strenuous working conditions. Reasons for this discrepancy may include (1) change in perception of "strenuous working conditions"; (2) improved working conditions; (3) the development of "preventive" strategies by pregnant women. Occupation is a more reliable indicator of risk than self described working conditions.
authors.affiliation: INSERM Unité 149, Villejuif, France.
authors.forename: M J
authors.initials: MJ
authors.lastname: Saurel-Cubizolles
authors.forename: D
authors.initials: D
authors.lastname: Subtil
authors.forename: M
authors.initials: M
authors.lastname: Kaminski
mesh_terms: D004651:Employment; D005260:Female; D005602:France / Q000453:epidemiology; D006801:Humans; D007752:Obstetric Labor, Premature / Q000453:epidemiology*; D016273:Occupational Exposure; D009790:Occupations; D005082:Physical Exertion; D011247:Pregnancy; D012189:Retrospective Studies