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

From: Use of prescription stimulant for Attention Deficit Hyperactivity Disorder in Aboriginal children and adolescents: a linked data cohort study

Parameter Univariate Analysis Multivariate Analysisa
HR (95 % CI) P-Value HR (95 % CI) P-Value
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
  1. aAll parameters were included in the regression model so as to adjust each result for potential confounding by all other covariates