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Table 2 Best-fitting negative binomial regression model for each sex, examining suicide rates over time, by age and Indigenous groups

From: Are young female suicides increasing? A comparison of sex-specific rates and characteristics of youth suicides in Australia over 2004–2014

Predictors IRR 95% CIs p Pseudo R 2
Females
 Time 1.03 1.01–1.06 .014 0.32
 Age groupa    < .0001  
  15–19 years 6.80 5.07–9.10   
  20–24 years 8.33 6.24–11.11   
 Aboriginal/TSIb 4.12 3.41–4.98 < .0001  
Males
 Time 0.98 0.91–1.05 .556 0.34
 Age groupa    < .0001  
  15–19 years 9.59 6.34–14.52   
  20–24 years 20.89 13.94–31.30   
 Age group x Timea    .018  
  15–19 years 1.03 0.96–1.11   
  20–24 years 0.99 0.92–1.06   
 Aboriginal/TSIb 3.42 3.05–3.83 < .0001  
  1. IRR Incident rate ratio, 95% CIs 95% Confidence Intervals, Aboriginal/TSI Aboriginal and/or Torres Strait Islander origin
  2. a‘10–14-year-old’ age group was the reference category
  3. b‘Non−/Unknown Aboriginal or Torres Strait Islander' origin group was the reference category