collected on the birth records. These analyses indicated a slight tendency for infants of responders to have higher Apgar1 scores (M=8.97 vs. 8.94 on a scale ranging from 1 to 10), higher birth weight (M=3516 vs. 3460 g), and a higher number of prenatal visits (M=10.50 vs.10.31). Responders were also more likely to be Caucasian (88% of total births vs. 91% of responders), have higher educational levels, and have a female infant. These differences were significant given the very large sample size, even though the size of the differences was generally small (Cohen's d>.22 in all analyses).
