Table 2 Hazard ratios and 95 % CI of prescription stimulant medication in Aboriginal and non-Aboriginal children and adolescents

Parents Aboriginal status

Non-Aboriginal parents

1.0

1.0

Both parents Aboriginal

0.45(0.37–0.55)

<0.001

0.33(0.26–0.42)

<0.001

Only father Aboriginal

1.13(0.92–1.38)

0.26

0.92(0.74–1.14)

0.45

Only mother Aboriginal

0.78(0.61–1.01)

0.059

0.69(0.53–0.90)

0.006

Mothers’ age group in years at birth

<20

1.54(1.36–1.73)

<0.001

1.52(1.33–1.74)

<0.001

20–24

1.44(1.32–1.56)

<0.001

1.42(1.30–1.56)

<0.001

25–29

1.0

1.0

30–34

0.82(0.75–0.90)

<0.001

0.88(0.80–0.96)

0.007

35–39

0.84(0.74–0.95)

0.006

0.90(0.79–1.03)

0.14

≥40

0.84(0.62–1.13)

0.24

0.83(0.60–1.16)

0.28

Sex

Female

1.0

1.0

Male

3.83(3.53–4.15)

<0.001

3.85(3.53–4.20)

<0.001

Geographical remoteness

Metropolitan

1.0

1.0

Rural

0.95(0.87–1.03)

0.18

0.87(0.80–0.94)

<0.001

Remote

0.58(0.50–0.68)

<0.001

0.63(0.54–0.74)

<0.001

Socioeconomic disadvantage

Least disadvantaged

1.0

1.0

Less disadvantaged

1.21(1.12–1.32)

<0.001

1.19(1.09–1.30)

<0.001

Little disadvantaged

1.39(1.24–1.56)

<0.001

1.32(1.18–1.49)

<0.001

More disadvantaged

1.31(1.12–1.53)

<0.001

1.31(1.12–1.53)

<0.001

Most disadvantaged

1.88(1.70–2.09)

<0.001

2.03(1.82–2.27)

<0.001