Figure 1.

Description of the process used to identify the study population and cases from the original MAX files containing enrollment and claims records for Texas Medicaid-enrolled children aged 0–17 years, 2004–2007. The numbers of children with at least one ≥13-month enrollment span, in the combined enrollment and case file and in the remaining study population, represent the number of ≥13-month enrollment spans; a child could have more than one enrollment span during the 4-year study period. MAX, Medicaid analytic extract.