Table 3 Univariate logistic regressions of factors associated with underreporting

 Male

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Female

0.9

(0.7–1.2)

1.1

(0.8–1.6)

0.5

(0.2–1.0)*

Age (per year increase in age from age 18)

0.96

(0.95–0.97)**

0.98

(0.97–0.99)**

0.99

(0.96–1.02)

 18–44 years

1.0 (ref)

1.0 (ref)

1.0 (ref)

 45–64 years

0.4

(0.2–0.6)**

0.5

(0.3–0.7)**

1.2

(0.4–4.0)

 65+

0.2

(0.1–0.3)**

0.5

(0.3–0.8)**

0.8

(0.2–2.5)

 Major cities

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Inner regional areas

0.9

(0.6–1.3)

1.0

(0.6–1.4)

1.0

(0.4–2.5)

 Other areas

1.0

(0.6–1.5)

1.1

(0.6–1.8)

0.7

(0.3–1.7)

 Quintile 1 (lowest income)

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Quintile 2

1.0

(0.7–1.5)

0.9

(0.5–1.6)

1.0

(0.4–2.6)

 Quintile 3

1.6

(1.0–2.6)

0.8

(0.5–1.4)

4.1

(1.5–10.8)**

 Quintile 4

1.9

(1.2–3.1)**

1.2

(0.7–2.0)

2.9

(1.0–8.5)

 Quintile 5 (highest income)

2.4

(1.5–3.8)**

1.0

(0.6–1.7)

3.4

(1.1–10.7)*

 Quintile 1 (highest disadvantage)

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Quintile 2

0.9

(0.6–1.5)

1.0

(0.6–1.8)

2.5

(0.8–7.8)

 Quintile 3

1.0

(0.6–1.5)

1.3

(0.7–2.3)

1.0

(0.3–3.3)

 Quintile 4

0.9

(0.6–1.5)

0.9

(0.5–1.6)

2.8

(0.9–8.3)

 Quintile 5 (lowest disadvantage)

1.4

(0.8–2.2)

0.9

(0.5–1.7)

4.1

(1.4–12.3)*

 Year 9 or below

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Year 10 or equivalent

1.2

(0.8–1.8)

1.3

(0.8–2.1)

1.4

(0.5–3.8)

 Year 11 or equivalent

2.3

(1.4–4.0)**

1.5

(0.8–2.7)

1.8

(0.5–6.0)

 Year 12 or equivalent

1.7

(1.2–2.5)**

1.8

(1.2–2.9)**

1.0

(0.4–2.7)

 Fluent

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Not fluent

1.2

(0.6–2.5)

0.7

(0.3–1.3)

2.7

(0.7–10.1)

 Australia

1.0 (ref)

1.0 (ref)

1.0 (ref)

 Not Australia

1.2

(0.9–1.6)

1.0

(0.7–1.4)

1.1

(0.5–2.3)