Previous analyses demonstrated self-reported pregravid weight had good agreement with measured weights (intraclass correlation coefficient (ICC) = 0.90, 95 % CI (0.87, 0.92) for weight measured 180–0 days prior to pregnancy; ICC = 0.95, 95 % CI (0.90, 0.97) for weight measured within the first 42 days of pregnancy) and underestimated measured pre-pregnancy and early pregnancy weights by an average of 1.1 kg (SD = 3.2) and 1.1 kg (SD = 2.2), respectively