Normalized data reported as means with SDs, non-normalized data reported as medians with 25% and 75% P values are for ANOVAs done over all 3 categories.
Clinical characteristics of patients separated into age quartiles. Statistical significance between groups was tested by chi square test for categorical data (gender) or ANOVA for multiple comparisons
aIncidence is calculated as the number of cases per 10,000 discharges during each specified year.bFor each year, the incidence rates are significantly different between each age group, analyses based