Table 2. Crude and adjusted incidence rates and incidence odds ratios of GDM by residential area socio-economic status, Victoria 1999–2008.

	INCIDENCE RATES (%)		INCIDENCE ODDS RATIOS (95% CI)
SES Quartile	Crude	Age-adjusted	Crude	Adjusted for age group	Adjusted for age group and marital status	Adjusted for age group and plurality	Adjusted for age group and region of birth	Fully adjusted model**
1	4.86	5.52	REF	REF	REF	REF	REF	REF
(most deprived)		(5.33–5.71)
2	4.18	4.45	0.86	0.8	0.79	0.79	0.93	0.93
		(4.29–4.61)	(0.81–0.90)	(0.75–0.84)	(0.75–0.83)	(0.75–0.84)	(0.88–0.98)	(0.88–0.98)
3	4.34	4.24	0.89	0.76	0.75	0.76	0.88	0.88
		(4.09–4.39)	(0.84–0.94)	(0.72–0.80)	(0.71–0.79)	(0.72–0.80)	(0.83–0.93)	(0.83–0.93)
4	4.12	3.62	0.84	0.64	0.64	0.64	0.73	0.73
(least deprived)		(3.49–3.75)	(0.80–0.89)	(0.61–0.68)	(0.60–0.67)	(0.61–0.68)	(0.69–0.77)	(0.69–0.77)
unknown	3.8	4.06	0.77	0.72	0.72	0.72	0.84	0.84
		(2.75–5.37)	(0.55–1.09)	(0.51–1.02)	(0.51–1.01)	(0.51–1.01)	(0.60–1.19)	(0.60–1.19)

** adjusted for age group, marital status, plurality, region of birth. Excludes those for whom SES quartile not known.