Work activity in pregnancy, preventive measures, and the risk of delivering a small-for-gestational-age infant.
OBJECTIVE
We undertook a case-control study to evaluate whether some occupational conditions during pregnancy increase the risk of delivering a small-for-gestational-age (SGA) infant and whether taking measures to eliminate these conditions decreases that risk.


METHODS
The 1536 cases and 4441 controls were selected from 43898 women who had single live births between January 1997 and March 1999 in Québec, Canada. The women were interviewed by telephone after delivery.


RESULTS
The risk of having an SGA infant increased with an irregular or shift-work schedule alone and with a cumulative index of the following occupational conditions: night hours, irregular or shift-work schedule, standing, lifting loads, noise, and high psychological demand combined with low social support. When the conditions were not eliminated, the risk increased with the number of conditions (P(trend) =.004; odds ratios=1.00, 1.08, 1.28, 1.43, and 2.29 for 0, 1, 2, 3, and 4-6 conditions, respectively). Elimination of the conditions before 24 weeks of pregnancy brought the risks close to those of unexposed women.


CONCLUSIONS
Certain occupational conditions experienced by pregnant women can increase their risk of having an SGA infant, but preventive measures can reduce the risk.
Croteau
Agathe
A
Public Health Direction, 2400, avenue D'Esti-mauville, Québec, Québec G1E 7G9, Canada. agathe.croteau@ssss.gouv.qc.ca.
Marcoux
Sylvie
S
Brisson
Chantal
C
D000328:Adult; D016022:Case-Control Studies; D005260:Female; D015438:Health Behavior; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age; D015999:Multivariate Analysis; D009790:Occupations / Q000706:statistics & numerical data*; D011247:Pregnancy; D011792:Quebec / Q000453:epidemiology; D018570:Risk Assessment; D012959:Socioeconomic Factors; D014931:Women, Working