TABLE 1

Demographic Characteristics of the Study Group

Overall (N = 32 354), n (%)2009–2013 (n = 14 785), n (%)2014–2018 (n = 17 569), n (%)P
Age, y
 <18245 (25.5)3650 (24.7)4595 (26.2)<.001
 1–415 162 (46.9)7311 (49.4)7851 (44.7)
 5–95522 (17.1)2444 (16.5)3078 (17.5)
 10–183425 (10.6)1380 (9.3)2045 (11.6)
Sex
 Male16 811 (52.0)7784 (52.6)9027 (51.4).023
 Female15 543 (48.0)7001 (47.4)8542 (48.6)
Race and ethnicity
 Non-Hispanic white17 180 (53.1)8124 (54.9)9056 (51.5)<.001
 Non-Hispanic African American5369 (16.6)2483 (16.8)2886 (16.4)
 Hispanic6259 (19.3)2530 (17.1)3729 (21.2)
 Asian American868 (2.7)338 (2.3)530 (3.0)
 Other2678 (8.3)1310 (8.9)1368 (7.8)
Season
 Spring10 582 (32.7)5060 (34.2)5522 (31.4)<.001
 Summer5861 (18.1)2602 (17.6)3259 (18.5)
 Fall6441 (19.9)2744 (18.6)3697 (21.0)
 Winter9470 (29.3)4379 (29.6)5091 (29.0)
Payer
 Government17 544 (54.2)7456 (50.4)10 088 (57.4)<.001
 Private12 944 (40.0)6197 (41.9)6747 (38.4)
 Other1866 (5.8)1132 (7.7)734 (4.2)
  • —, not applicable.