Statistically significant differences in SES were not seen between the two studies justifying the merging of the data from each of them, though minor risk group differences within studies were seen. For CPFFS participants SES values were: HR = 38.2 ± 10.6 and LR = 44.2 ± 11.76, adjacent Hollingshead strata. For the BRFFS study: HR = 36.2 ± 12.6 and LR = 45.9 ± 11.7. The overall minority rate in our series of families is 13%.
