Analyses included measures of central tendency (e.g. means and proportions) as well as tests for differences (e.g. chi-square and one-way analysis of variance tests) across the following age categories: 5 years and younger; 6 to 17 years; and 18 years and older. The Fisher’s exact test, as compared to the Chi-square test, was used whenever a cell size in any of the tabulations across age categories was less than five. The survey sample was also compared with the SPARK population on all sociodemographic and clinical characteristics to identify any significant differences. Data were analyzed using Stata version 12.1.

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