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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
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BMC Public Health

ISSN: 1471-2458

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