| http://www.w3.org/ns/prov#value | - In initial log-rank and proportional hazards analyses of individual factors, a number of factors were associated with delayed fertility at a significance level (p-value) of .10 or less: contraceptive method used; duration of IUD use; maternal age; social class, based on the husband's occupation; smoking history; and history of gynecologic and other illnesses.
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