Table 2 Odds ratios (OR) and 95 % confidence intervals (CI) for association between demographic characteristics and probable exposure

Age (years) Linear

0.99(0.98,0.999)

1.01(0.99,1.02)

Age (men)

18–34 years

53.2

1.30(1.03,1.68)

1.32(0.85,2.04)

35–64 years

46.3

1

1

Age (women)

18–50 years

37.9

1

1

51–64 years

43.3

1.25(1.06,1.47)

1.06(0.77,1.46)

Country of birth

Australia

49.2

1

1

41.5

1

1

other

39.9

0.68(0.56,0.83)

1.40(0.97,2.03)

36.1

0.80(0.65,0.98)

0.87(0.58,1.32)

Highest education level

 Bachelor or higher

28.5

1

1

41.6

1

1

 Vocational/trade/TAFE

59.2

3.64(2.93,4.52)

1.90(1.24,2.92)

40.8

0.96(0.79,1.18)

1.30(0.86,1.96)

 High school or lower

53.6

2.86(2.33,3.50)

1.34(0.88,2.05)

38.4

0.87(0.72,1.06)

1.13(0.71,1.78)

 refused

18.2

0.56(0.12,2.60)

0.12(0.02,0.91)

50.0

1.40(0.40,4.87)

2.55(0.31,20.97)

State of residence

 New South Wales

41.7

1

1

35.9

1

1

 Victoria

61.3

2.22(1.78,2.76)

1.84(1.19,2.85)

49.1

1.72(1.39,2.14)

0.76(0.47,1.25)

 Queensland

45.4

1.18(0.43,3.22)

1.03(0.69,1.53)

37.4

1.06(0.39,2.90)

0.94(0.59,1.50)

 Western Australia

40.3

0.94(0.72,1.23)

0.78(0.49,1.23)

40.2

1.20(0.90,1.60)

0.45(0.53,1.67)

 South Australia

40.4

0.99(0.92,1.06)

1.49(0.81,2.74)

39.4

1.03(0.96,1.10)

0.97(0.52,1.84)

 Tasmania

49.2

1.35(0.80,1.28)

3.26(1.27,8.36)

34.8

0.95(0.51,1.78)

0.33(0.08,1.31)

 Australian Capital Territory

44.7

1.13(0.62,2.04)

2.07(0.65,6.60)

38.6

1.12(0.60,2.10)

1.44(0.45,4.59)

 Northern Territory

38.5

0.87(0.39,1.95)

0.33(0.09,1.16)

33.3

0.89(0.41,1.93)

1.72(0.41,7.16)

SES of residential area

 Highest quintile^b

38.2

1

1

33.3

1

1

 Fourth

41.8

1.16(0.91,1.49)

0.86(0.55,1.34)

38.6

1.26(0.98,1.62)

1.17(0.72,1.91)

 Third

51.4

1.71(1.34,2.18)

1.02(0.66,1.58)

37.9

1.22(0.95,1.57)

1.00(0.61,1.67)

 Second

51.3

1.72(1.35,2.19)

0.72(0.45,1.14)

46.2

1.72(1.34,2.21)

1.24(0.74,2.08)

 Lowest

54.6

1.94(1.48,2.55)

0.66(0.40,1.09)

48.4

1.88(1.43,2.46)

1.66(0.93,2.95)

 unknown

100

0

Remoteness

 Major cities

37.3

1

1

34.6

1

1

 Inner regional

55.1

2.06(1.73,2.45)

1.04(0.70,1.53)

45.3

1.56(1.31,1.86)

1.23(0.78,1.92)

 Outer regional/Remote/very remote

64.1

3.00(2.29,3.94)

1.47(0.84,2.56)

48.9

1.81(1.39,2.35)

2.48(1.30,4.72)