Table 3.

Descriptive statistics for oral antibiotic fills during the early and late enrollment periods in the autism spectrum disorder (ASD) cohort and general population with no ASD diagnosis cohort (POP) cohort, and in their subcohorts describing children with and without a gastrointestinal (GI) symptom diagnosed during the late enrollment period (+GI and −no GI subcohorts, respectively). Where counts are reported, the group percentage is given in parentheses. For reported means, the standard deviation is in parentheses.

Statistic	Total ASD Cohort	ASD+GI Subcohort	ASD–no GI Subcohort	Total POP Cohort	POP+GI Subcohort	POP–no GI Subcohort
Number of children with an antibiotic fill during early enrollment	2892 (88.9%)	1108 (92.0%)	1784 (87.1%)	240764 (86.5%)	50569 (90.8%)	190195 (85.4%)
Mean number of antibiotic fills per child with a fill per year during early enrollment	1.95 (1.49)	2.12 (1.61)	1.85 (1.41)	1.83 (1.46)	2.06 (1.58)	1.77 (1.42)
Mean number of antibiotic fills per child per year during early enrollment	1.73 (1.53)	1.95 (1.64)	1.61 (1.45)	1.58 (1.49)	1.87 (1.62)	1.51 (1.45)
Number of children with an antibiotic fill during late enrollment	2583 (79.4%)	1032 (85.6%)	1551 (75.7%)	204926 (73.6%)	46753 (83.9%)	158173 (71.0%)
Mean number of antibiotic fills per child with a fill per year during late enrollment	1.87 (1.57)	2.18 (1.89)	1.66 (1.28)	1.57 (1.27)	1.89 (1.48)	1.48 (1.18)
Mean number of antibiotic fills per child per year during late enrollment	1.48 (1.59)	1.87 (1.91)	1.26 (1.32)	1.16 (1.29)	1.59 (1.53)	1.05 (1.20)