Table 1.

Descriptive statistics of study participants.

	Risk		Control
	risk_PTBa (n = 7)	risk_FTBb (n = 28)	non-risk PTBc (n = 1)	non-risk FTBd (n = 13)
Age (years)	31.43	33.14	42	34.08
BMI (kg/m2)	26.07	25.41	32.02	23.6
Gestational age at delivery (weeks)	33.06	39.71	36.7	39.67
<28 Weeks	1	0	0	0
28–32 Weeks	0	0	0	0
32–37 Weeks	6	0	1	1
Ethnicity
White Irish	6	24	1	12
White Caucasian	1	2	0	0
Asian	0	1	0	0
African	0	1	0	1
Smokers	1	3	0	0
Birth weight	2143.57	3666.43	2840	3602.38
LLETZ	2	9	0	0
Previous PTB	6	19	0	0
ABX within previous 6 months	3	6	0	2

^arisk_PTB preterm birth refers to those women who delivered prior to 37 weeks’ gestation.

^brisk_FTB refers to those women with risk factors for preterm birth but who delivered full term.

^cnon-risk PTB refers to low-risk women who delivered prior to 37 weeks’ gestation.

^dnon-risk FTB refers to low-risk women who delivered at term.