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Table 5 Rates of mental health hospitalisations for injured and non-injured cohorts, with rate ratios and 95% confidence intervals, by injury type and injury severity

From: Mental health: A cause or consequence of injury? A population-based matched cohort study

   

Number of Mental Health Hospitalisations

    

Injury Types and Severity Level

  

Injured

(N = 21,032)

Non-Injured

(N = 21,032)

Unadjusted Rate Ratio

95% Confidence Interval

Adjusted Rate Ratio *

95% Confidence Interval

 

N

%

Hosp

%

/100 PYs

Hosp

%

/100 PYs

    

Injury Subgroup

            

   Brain injury

1,290

6.1

260

4.3

2.44

89

9.3

0.79

3.16

2.03–4.92

2.82

1.84–4.33

   Spinal injury

95

0.5

2

0.0

0.24

1

0.1

0.12

3.45

0.07–155.69

   Burns

524

2.5

150

2.5

3.25

14

1.5

0.31

9.93

4.12–23.94

6.70

2.52–17.76

   Fracture of long bones

2,515

12

362

6.0

1.63

111

11.6

0.50

3.41

2.36–4.91

2.62

1.82–3.76

   Poisonings

2,169

10.3

2,358

39.1

12.68

140

14.6

0.72

18.72

14.75–23.76

5.74

4.48–7.35

   Internal injuries

593

2.8

98

1.6

1.91

30

3.1

0.59

2.90

1.43–5.85

3.09

1.57–6.10

   All other injuries

13,846

65.8

2,804

46.4

2.27

572

59.8

0.47

5.03

4.34–5.82

2.91

2.54–3.35

Injury Severity Score (ISS)

            

   Minor (ISS 1–8)

14,599

69.4

2,716

45.0

2.08

620

64.8

0.48

4.34

3.75–5.02

2.60

2.27–2.99

   Moderate (ISS 9–15)

1,746

8.3

270

4.5

1.79

63

6.6

0.41

4.72

3.03–7.37

3.14

2.05–4.80

   Severe (ISS = 16)

657

3.1

120

2.0

2.43

49

5.1

0.84

3.17

1.63–6.17

3.86

1.98–7.54

   No ISS Computed †

4,030

19.2

2,928

48.5

8.45

225

23.5

0.63

14.43

11.86–17.57

5.07

4.17–6.15

  1. * Adjusted for age, gender, place of residence, and comorbidities in 12 months prior to injury date (including CCI, cumulative LOS, number of physician claims, pre-existing psychiatric condition, pre-existing musculoskeletal condition and previous injuries)
  2. ISS scores not computed for ICD-9-CM codes 930–939 foreign bodies; 958 complications; 960–979 poisonings; 980–989 toxic substances; 990–995 other.