Table 4 Proportion of gestational diabetes attributable to each maternal characteristic

Maternal age at conception

 < 20 years

-0.01 (-0.02, 0.00)

 20–24.9 years

-0.03 (-0.05, -0.02)

 25–34.9 years

Reference

 35–39.9 years

0.13 (0.11, 0.15)

 40 years and over

0.03 (0.02, 0.04)

Pre-pregnancy BMI category^b

 Underweight

-0.01 (-0.01, 0.00)

 Healthy weight

Reference

 Overweight

0.12 (0.11, 0.14)

 Obese

0.13 (0.11, 0.14)

Ethnicity

 Caucasian

Reference

 South Asian

0.21 (0.19, 0.23)

 Middle Eastern

0.10 (0.07, 0.13)

 East and Southeast Asian

0.08 (0.07, 0.09)

 Aboriginal and Torres Strait Islander

0 (0.00, 0.01)

Socioeconomic disadvantage: SEIFA quintile^c

 Q1 (most disadvantaged)

0.04 (0.02, 0.06)

 Q2

0.01 (-0.02, 0.03)

 Q3

0 (-0.02, 0.02)

 Q4

-0.02 (-0.04, 0.00)

 Q5 (least disadvantaged)

Reference

Nulliparity

0.16 (0.14, 0.19)

Prior history of gestational diabetes

0.16 (0.15, 0.16)

First degree family member or sister with diabetes

0.14 (0.11, 0.16)

Polycystic ovarian syndrome

0.02 (0.01, 0.03)