Table 2 Associations of mental health conditions with subsequent self-harm, assault and unintentional injuries across 30 years in the New Zealand population, using diagnoses from inpatient hospital records

From: Mental health conditions are associated with increased risk of subsequent self-harm, assault and unintentional injuries in two nations

Men

  

N (%) with mental health condition or injury in 30-year period

Adjusted RR for subsequent injury (95% CI)

Birth years and

age at baseline

(July 1989)

N

Mental health conditiona

Self-harm injury

Assault injury

Unintentional injury

Self-harm injury

Assault injury

Unintentional injury

Born 1970–1979;

aged 10–19 years

278,937

12,057

(4.3)

5,910

(2.1)

13,347

(4.8)

82,404

(29.5)

19.53

(18.16–21.01)

4.25

(3.97–4.55)

1.79

(1.72–1.86)

Born 1960–1969;

aged 20–29 years

297,105

11,289

(3.8)

4,803

(1.6)

9,012

(3.0)

73,476

(24.7)

27.62

(25.49–29.93)

5.36

(4.97–5.79)

1.87

(1.80–1.95)

Born 1950–1959;

aged 30–39 years

254,865

7,830

(3.1)

2,529

(1.0)

3,681

(1.4)

54,384

(21.3)

34.41

(30.82–38.41)

7.05

(6.25–7.95)

2.00

(1.91–2.10)

Born 1940–1949;

aged 40–49 years

180,210

4,836

(2.7)

1,011

(0.6)

1,236

(0.7)

37,182

(20.6)

39.36

(32.60–47.52)

7.91

(6.29–9.96)

2.09

(1.97–2.22)

Born 1929–1939;

aged 50–60 years

115,758

3,498

(3.0)

507

(0.4)

408

(0.4)

27,093

(23.4)

23.49

(17.54–31.46)

5.62

(3.47–9.09)

1.77

(1.65–1.91)

Women

  

N (%) with mental health condition or injury in 30-year period

Adjusted RR for subsequent injury (95% CI)

Birth years and

age at baseline

(July 1989)

N

Mental health conditiona

Self-harm injury

Assault injury

Unintentional injury

Self-harm injury

Assault injury

Unintentional injury

Born 1970–1979;

aged 10–19 years

267,207

10,317

(3.9)

8,616

(3.2)

4,269

(1.6)

37,950

(14.2)

16.87

(15.81–17.99)

6.22

(5.62–6.88)

2.64

(2.52–2.77)

Born 1960–1969;

aged 20–29 years

289,827

10,146

(3.5)

6,219

(2.1)

2,913

(1.0)

34,278

(11.8)

26.80

(25.03–28.71)

7.55

(6.69–8.53)

2.71

(2.59–2.84)

Born 1950–1959;

aged 30–39 years

251,049

6,492

(2.6)

3,066

(1.2)

1,113

(0.4)

28,068

(11.2)

35.61

(32.27–39.29)

11.32

(9.34–13.73)

2.93

(2.77–3.10)

Born 1940–1949;

aged 40–49 years

181,458

4,608

(2.5)

1,248

(0.7)

357

(0.2)

25,164

(13.9)

47.71

(40.45–56.27)

10.24

(7.01–14.96)

2.74

(2.58–2.91)

Born 1929–1939;

aged 50–60 years

122,391

4,038

(3.3)

516

(0.4)

144

(0.1)

29,670

(24.2)

37.32

(28.63–48.66)

3.59

(1.55–8.35)

1.83

(1.72–1.95)

  1. Models controlled for birth year and whether individuals had an injury admission before their first admission for a mental health condition. Per Statistics New Zealand confidentiality rules, counts were randomly rounded to base three.
  2. aMental health conditions included substance use, psychotic, mood, neurotic (anxiety), physiological disturbance, personality, developmental, behavioral and unspecified disorders.
Back to article page