Table 2.

Neonatal characteristics based on prenatal antibiotic received for GBS positive mothers of full-term neonates.

	All neonates (n = 97,983)	First-line antibiotics (n = 49,234)	Second-line antibiotics (n = 12,679)	No antibiotics (n= 36,070)	p-value
Gestational age, median [IQR], weeks	39 [38, 40]	39 [38, 40]	39 [38, 39]	39 [38, 39]	<.001
Birth weight, median [IQR], kg	3.33 [2.98, 3.70]	3.33 [2.99, 3.68]	3.36 [2.98, 3.76]	3.32 [2.95, 3.71]	<.001
Length, median [IQR], cm	50.8 [48.5, 52]	50.8 [48.7, 52.1]	50.5 [48.3, 52]	50.2 [48.3, 52]	<.001
Head circumference, median [IQR], cm	34 [33, 35.5]	34 [33, 35]	34.5 [33, 35.5]	34.3 [33, 35.5]	<.001
Female	41,297 (42.1)	20,912 (42.5)	5,287 (41.7)	15,098 (41.9)	.11
Singleton	96,400 (98.4)	48,807 (99.1)	12,370 (97.6)	35,223 (97.7)	<.001
Mode of Delivery					<.001
Vaginal	54,514 (55.6)	34,277 (69.6)	4,450 (35.1)	15,787 (43.8)
Caesarean-section	41,885 (42.7)	14,358 (29.2)	8,041 (63.4)	19,486 (54.0)
5-minute APGAR, median [IQR]	9 [8, 9]	9 [8, 9]	9 [8, 9]	9 [8, 9]	<.001
10-minute APGAR, median [IQR]	8 [7, 9]	8 [7, 9]	8 [7, 9]	8 [7, 9]	<.001

Data are presented as n (%) unless otherwise specified.

GBS, Group B Streptococcus; IQR, Interquartile Range.

Chi square and Kruskal-Wallis tests were used to assess for differences across groups by type of antibiotic received for each variable.