Table 2 Medians (Lower and Upper Quartiles) or Counts (%) for potential clinical predictors for sPTB <37 weeks and <34weeks.

	Cork					Auckland
	Term Birth N = 109	Spontaneous Preterm Birth <37w N = 55	p-value <37w vs term	Spontaneous Preterm Birth <34w N = 16	p-value <34w vs term	Term Birth N=102	Spontaneous Preterm Birth <37w N = 55	p-value <37w vs term	Spontaneous Preterm Birth <34w N = 13	p-value <34w vs term
Maternal height (cm)	165 (161, 168)	165 (160, 168)	0.99	167 (160, 169)	0.48	165 (161, 169)	165 (162, 168)	0.8	164 (162, 168)	0.53
Infant sex
Female	47 (43%)	24 (44%)	>0.99	7 (44%)	1 *	47 (46%)	24 (44%)	0.9	4 (31%)	0.38*
Male	62 (57%)	31 (56%)		9 (56%)		55 (54%)	31 (56%)		9 (69%)
Smoking in pregnancy
no smoking	82 (75%)	40 (72%)	0.78 §	10 (62%)	0.33*	92 (90%)	44 (80%)	0.06* § 0.03*,^†	12 (92%)	1*^,§
quit	17 (16%)	8 (15%)	0.66^†	3 (19%)		7 (7%)	4 (7%)		1 (8%)
current smoker	10 (9%)	7 (13%)		3 (19%)		3 (3%)	7 (13%)		0
Fertility Treatment	7 (6%)	2 (4%)	0.72*	2 (13%)	0.32*	11 (11%)	7 (13%)	0.92	2 (15%)	0.64*
Previous Miscarriage	15 (14%)	10 (18%)	0.61	4 (25%)	0.26*	15 (15%)	6 (11%)	0.67	2 (15%)	1*
Gravidity
1	91 (83%)	43 (78%)	0.55*	12 (75%)	0.39*	73 (72%)	37 (67%)	0.36*	8 (62%)	0.35*
2	13 (12%)	10 (18%)		2 (13%)		23 (23%)	11 (20%)		3 (23%)
3 or more	5 (5%)	2 (4%)		2 (13%)		6 (6%)	7 (13%)		2 (15%)
Vaginal bleeding before 15 w visit	23 (21%)	23 (42%)	0.01	9 (56%)	0.01*	22 (22%)	14 (25%)	0.72	3 (23%)	1*
Any infection before 15 w visit^a	26 (24%)	11 (20%)	0.72	5 (31%)	0.54*	45 (44%)	24 (44%)	>0.99	6 (46%)	1*

P-values are from tests of case-control differences using the Mann-Whitney test (Continuous variables), Chi-squared test (categorical variables with adequate counts) or Fisher’s exact test (*). ^§p-value for the three categories. ^†p-value for current smoker vs no smoking in pregnancy. ^aAny infection during pregnancy means upper respiratory or urinary tract infection, pyelonephritis, gastrointestinal infection, vaginal candidiasis or other infections.

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