| http://www.w3.org/ns/prov#value | - Intake of calcium and vitamin D was measured in 1991, 1995, and 1999 by a food frequency questionnaire.Results After adjustment for age, parity, smoking status, and other risk factors, women in the highest quintile of total vitamin D intake (median, 706 IU/d) had a relative risk of 0.59 (95% confidence interval, 0.40-0.86) compared with those in the lowest quintile (median, 112 IU/d) (P = .01 for
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