For each substance used during pregnancy, a median for the entire group of mothers reporting any use was calculated. The median split was then used to categorize each mother’s use of that substance during pregnancy. A third group was formed from those without any use. Across the entire sample, for mothers who drank during pregnancy, the median number of drinks consumed was 48. Using the median split, thirty-nine HR mothers (66%) were above the median compared to only 1 (4.5%) of the LR mothers. The median number of cigarettes used by HR and LR was 2700, with 41% of HR mothers reporting smoking in the range above the median, compared to 31% of the LR mothers.
