Pregnancy outcomes before and after institution of a specialised twins clinic: a retrospective cohort study

Table 1 Demographic characteristics for the women by model of care and year of birth

	Model of Care
	ANC	TC	PRIVATE	p value^a
	(2007–2010)	(2009–2011)	(2009–2011)	p value^a
Baseline characteristics n = 286	N = 84	N = 101	N = 101
Maternal age at delivery, years (mean ± SD)	32.5 ± 4.7	32.6 ± 4.5	35.8 ± 4.5	<0.001
BMI pre-pregnancy (kg/m²) (mean ± SD)	24.8 ± 6.7	24.3 ± 5.1	23.6 ± 3.2	0.29
	N (%)	N (%)	N (%)
Born in Australia	44 (52)	57 (56)	73 (72)	<0.001
Nulliparous	52 (62)	61 (60)	65 (64)	0.84
Chorionicity
DCDA	66 (79)	70 (69)	71 (72)	0.32
MCDA	16 (19)	31 (31)	28 (28)	0.18
MCMA	0 (0)	0 (0)	0 (0)	1
Unknown	2 (2)	0 (0)	2 (2)

SD standard deviation, BMI body mass index, DCDA dichorionic, diamniotic, MCDA monochorionic, diamniotic, MCMA monochorionic, monoamniotic
^aOverall ANC Vs. TC Vs. Private comparison (ANC antenatal clinic, TC twins clinic)

ISSN: 1471-2393