TABLE 1

Demographics of Included Infants in the 2015 and 2017 Cohorts

Total2015 Cohort2017 Cohort
Patients 0–60 d of age
 No. ED encounters550832382270
 Age, median (IQR), d25 (12–41)25 (12–41)24 (11–41)
 No. boys (%)2594 (47.1)1520 (46.9)1074 (47.3)
 Race, n (%)
  White3002 (54.5)1784 (55.1)1218 (53.7)
  African American1316 (23.9)777 (24.0)539 (23.7)
  Asian American79 (1.4)48 (1.5)31 (1.4)
  Other or unknown1111 (20.2)629 (19.4)482 (21.2)
 Ethnicity, n (%)
  Hispanic1181 (21.4)683 (21.1)498 (21.9)
  Not Hispanic3925 (71.3)2333 (72.1)1592 (70.1)
  Not known402 (7.3)222 (6.9)180 (7.9)
 Geographic region, n (%)
  Midwest1184 (21.5)711 (22.)473 (20.8)
  South2497 (45.3)1475 (45.6)1022 (45.0)
  Northeast803 (14.6)455 (14.1)348 (15.3)
  West1024 (18.6)597 (18.4)427 (18.8)
 Payment, n (%)
  Public insurance3796 (68.9)2274 (70.2)1522 (67.0)
  Private insurance1434 (26.0)839 (25.9)595 (26.2)
  Self-pay159 (2.9)85 (2.6)74 (3.3)
  Other or unknown119 (2.2)40 (1.2)79 (3.5)
Patients 61–365 d of age
 No. ED encounters399323701623
 Age, median (IQR), d113 (80–182)113 (81–178)112 (80–186)
 No. boys (%)2080 (52.1)1243 (52.4)837 (51.6)
 Race, n (%)
  White2294 (57.5)1370 (57.8)924 (56.9)
  African American823 (20.6)491 (20.7)332 (20.5)
  Asian American52 (1.3)33 (1.4)19 (1.2)
  Other or unknown824 (20.6)476 (20.1)348 (21.4)
 Ethnicity, n (%)
  Hispanic865 (21.7)501 (21.1)364 (22.4)
  Not Hispanic2846 (71.3)1723 (72.7)1123 (69.2)
  Not known282 (7.1)146 (6.2)136 (8.4)
 Geographic region, n (%)
  Midwest845 (21.2)529 (22.3)316 (19.5)
  South1784 (44.7)1049 (44.3)735 (45.3)
  Northeast538 (13.5)305 (12.9)233 (14.4)
  West826 (20.7)487 (20.5)339 (20.9)
 Payment, n (%)
  Public insurance2837 (71.0)1719 (72.5)1118 (68.9)
  Private insurance999 (25.0)582 (24.6)417 (25.7)
  Self-pay77 (1.9)44 (1.9)33 (2.0)
  Other or unknown80 (2.0)25 (1.1)55 (3.4)
  • IQR, interquartile range.