Table 7. Logistic regression modelling for outcome of SGA (z score<2).

	Unadjusted					Adjusted
	Number	OR	95% CI		Sig.	Number	OR	95% CI		Sig.
Obstetric Antecedents			Lower	Upper				Lower	Upper
Spontaneous preterm birtha without maternal complications	41,816	1.00				16,554	1.00
Spontaneous preterm birtha with maternal complications	15,690	1.36	1.16	1.59	<0.05	6,077	1.19	0.88	1.62	0.26
Preterm birth with pPROM without maternal complications	10,388	0.29	0.20	0.41	<0.05	5,468	0.19	0.10	0.37	<0.05
Preterm birth with pPROM with maternal complications	1,723	0.32	0.14	0.71	<0.05	830	0.42	0.13	1.33	0.14
Preterm induction/elective caesarean delivery without maternal complications	8,646	4.20	3.66	4.83	<0.05	4,593	3.98	3.12	5.06	<0.05
Preterm induction/elective caesarean delivery with maternal complications	8,500	2.21	1.87	2.61	<0.05	3,339	2.07	1.50	2.85	<0.05

Unadjusted and adjusted ORs with 95% CI and p values in relation to maternal conditions. ORs have been adjusted for deprivation, parity, smoking, health board of residence, and cohort birth period. Cohort includes preterm births <37 wk gestation only, 1980 to 2004 inclusive.

^aIn the absence of pPROM.