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Relationship between maternal dietary heme iron intake in early pregnancy and risk of GDM (solid line) with 95% CIs (dotted lines) after adjusting for daily energy intake; maternal age; race/ethnicity; parity; physical activity; prepregnancy BMI; and dietary fiber, vitamin C, saturated fat, cholesterol, and red and processed meat intake. The vertical bars along the dietary heme iron intake axis indicate the distribution of study subjects.
