Table 1.

Baseline Characteristics (online only)

		All Study Groups				Randomized Infants
	Overall	Group A (Antibiotics)	Group B (No antibiotics)	Group C Randomized	p-value†	Group C/Antibiotics	Group C/No Antibiotics	p-value†
(n)	98	32	11	55		28	27
Male	50 (51.0)	16 (50.0)	4 (36.4)	30 (54.6)	0.54	13 (46.4)	17 (63.0)	0.21
Cesarean delivery	58 (59.8)1	19 (59.4)	3 (27.3)	36 (66.7)1	0.05	17 (63.0)1	19 (70.4)	0.56
Singleton	75 (76.5)	24 (75.0)	10 (90.9)	41 (74.6)	0.48	20 (71.4)	21 (77.8)	0.59
Gestational Age	29.1 ± 2.8 [23.1, 32.9]	28.2 ± 2.9 [23.1, 32.9]	32.1 ± 1.0 [29.3, 32.9]	29.0 ± 2.6 [23.7, 32.7]	0.0002	29.2 ± 2.5 [23.7, 32.7]	28.8 ± 2.8 [23.7, 32.7]	0.59
Weight (g) at Birth	1240 ± 479 [490, 2770]	1138 ± 446 [490, 2132]	1900 ± 417 [1110, 2770]	1167±407 [525, 2425]	<0.0001	1234 ± 424 [525, 2425]	1098 ± 384 [605, 2116]	0.22
Length of stay (days)	56.4 ± 37.1 [0.0, 184.0]	64.5 ± 40.5 [0.0, 184.0]	26.5 ± 19.7 [9.0, 81.0]	57.7 ± 35.2 [1.0, 147.0]	0.01	53.9 ± 30.0 [13.0, 134.0]	61.6 ± 40.1 [1.0, 147.0]	0.42

Presented as n(%) or the mean ± standard deviation [min, max]

^†Chi-Square Test or ANOVA

¹n missing = 1; did not obtain consent to collect maternal data