a) Site readmission rates, per 1000 child-months, and ratios of hospital readmission to post-discharge mortality rates stratified by b) monthly follow-up, c) Cohort strata, and d) Site. Data are readmission rate, or readmission rate to mortality rate ratio, with 95% CI, CI; Confidence Intervals, the dotted lines show the overall point readmission rate or readmission rate to mortality rate ratio and the diamonds show their 95% CI.