PEDIATRICS Vol. 98 No. 5 November 1996, pp. A76
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RISK OF PRETERM BIRTH

. . . Lower social class, less education, single marital status, low income, trouble with "nerves" and depression, help from professional agencies, and little contact with neighbors were all significantly associated with an increased risk of preterm birth. There were no apparent effects of smoking, alcohol, or caffeine on the length of gestation overall.