. Author manuscript; available in PMC: 2023 Feb 4.

Published in final edited form as: Nat Microbiol. 2023 Jan 12;8(2):246–259. doi: 10.1038/s41564-022-01293-8

Table 1: Cohort characteristics.

sPTB, spontaneous preterm birth; TB, term birth; BMI, body mass index; GA, gestational age; p – two-sided Fisher’s Exact or Mann-Whitney U test. Bold – p<0.05.

	sPTB	TB	Difference (p value)
N	80	152
Race [N (%)]			0.417
Black	57 (71.25%)	116 (76.3%)	0.568
White	21 (26.25%)	30 (19.7%)	0.331
Other	2 (2.5%)	6 (4%)	0.666
Nulliparous [N (%)]	29.0 (36.2%)	55.0 (36.2%)	0.894
PTB history [N (%)]	34 (42.5%)	28 (19.2%)	0.0003
GA at delivery [median weeks [range]]	34 [21–36]	39 [38–39]	<1e-10
BMI [kg/m² mean±SD]	30.1±7.8	30.6±7.2	0.65
Age [years mean±SD]	29±6	28±6	0.28