Estimates of the vital statistic components of change from January to December of 2013 for Arkansas, Florida, and North Carolina, using the first wave of the 2014 SIPP. Bpop = total birth rate; Bpop:pov = rate contribution to birth rate from the poor; Bpop:aff = rate contribution to birth rate from the nonpoor; B%pop:PR = ratio of percentage of births who are poor relative to population prevalence of the poor. Vertical bars indicate 95% confidence intervals (not calculated for ratios of percentages).