Characteristics of US children and their parents.

1<p>Statistics are reported either as means with 95% Confidence Interval (CI) for continuous variables or percentages with their 95% Confidence Interval (CI) for categorical variables.</p>2<p>Chi-square tests were used to test for between-group differences for categorical variables; t-tests were used for continuous variables.</p><p>Source: Medical Expenditure Panel Survey, 2006–2007.