The example shows adjusted birth weight differences in grams (analyses of variance) by birth order between infants in families where the first or the second sibling had a registered specified birth defect and infants in families without registered birth defects (reference-group).

NTD-1 / NTD-2: Neural tube defect in first birth / second birth

AWD-1 / AWD-2: Abdominal wall defect in first birth / second birth

dBW: difference in mean birth weight

CI: confidence interval

Adjusted for gestational age, maternal age, maternal education, marital status, maternal diabetes, interpregnancy interval, time period