() II 346 Women with sufficient stored Skin phototype: Among women with dark skin, Deficiency was serum were randomly only 8% (95% CI: 5-12%) had adequate levels defined as selected from among all compared with 43% (95% CI: 33-53%) of those with <25nmolL(-1) , women who delivered light skin. insufficiency between April 2008 and and BMI: Obese women were found to have March 2009 in North West adequacy significantly lower vitamin D levels than non-obese London. Sample represented >75nmolL(-1) women (47 vs 35% deficiency). the total population regarding skin tone, quartile, BMI, gestation and parity () II 193 Plasma 25(OH)D was Season of birth (F = 7.86, P = 0.006) and Vitamin D status determined at 8-20 weeks plasma 25(OH)D concentration (F = categorized as gestation and following birth. 6.17, P = 0.014) were significant variables in the deficient Usual predictors of vitamin D change of vitamin D status while BMI, race, DHA (<30 nmol/L) or status (BMI, race, season) in status, and typical vitamin D intake (334 IU/day) insufficient addition to prenatal from prenatal supplements did not have an (30-49.9 nmol/L). supplemental vitamin D intake effect. and docosahexaenoic acid Season: Women who delivered in summer and fall (DHA) status at delivery were had a 1.5-fold greater plasma 25(OH)D assessed for their interaction concentration than women who delivered in on the change on plasma winter and spring (41.1 +/- 23.1 and 40.7 +/- 20.5 25(OH)D concentration nmol/L summer and fall, respectively, versus 27.7 between the two time points. +/- 17.9 and 29.3 +/- 21.4 nmol/L in winter and spring, respectively).
() II 346 Women with sufficient stored serum were randomly selected from among all women who delivered between April 2008 and March 2009 in North West London. Sample represented the total population regarding skin tone, quartile, BMI, gestation and parity Skin phototype: Among women with dark skin, only 8% (95% CI: 5-12%) had adequate levels compared with 43% (95% CI: 33-53%) of those with light skin. BMI: Obese women were found to have significantly lower vitamin D levels than non-obese women (47 vs 35% deficiency). Deficiency was defined as <25nmolL(-1) , insufficiency and adequacy >75nmolL(-1) () II 193 Plasma 25(OH)D was determined at 8-20 weeks gestation and following birth. Usual predictors of vitamin D status (BMI, race, season) in addition to prenatal supplemental vitamin D intake and docosahexaenoic acid (DHA) status at delivery were assessed for their interaction on the change on plasma 25(OH)D concentration between the two time points. Season of birth (F = 7.86, P = 0.006) and plasma 25(OH)D concentration (F = 6.17, P = 0.014) were significant variables in the change of vitamin D status while BMI, race, DHA status, and typical vitamin D intake (334 IU/day) from prenatal supplements did not have an effect. Season: Women who delivered in summer and fall had a 1.5-fold greater plasma 25(OH)D concentration than women who delivered in winter and spring (41.1 +/- 23.1 and 40.7 +/- 20.5 nmol/L summer and fall, respectively, versus 27.7 +/- 17.9 and 29.3 +/- 21.4 nmol/L in winter and spring, respectively). Vitamin D status categorized as deficient (<30 nmol/L) or insufficient (30-49.9 nmol/L).
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