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Table 3 Unadjusted (univariate analysis) and adjusted (multivariate analysis) rate ratios of potentially preventable hospitalisations (PPHs) from negative binomial regression analysis, stratified by PPH category and medical condition, 1 January 1990 to 30 June 2006

From: The impact of mental illness on potentially preventable hospitalisations: a population-based cohort study

PPH category/medical condition

URR (95% CI)

P value

ARR (95% CI)

P value

Vaccine-preventable

2.17 (2.04-2.32)

< 0.001

2.10(1.970-2.23)

< 0.001

   Influenza and pneumonia

2.19 (2.05-2.33)

< 0.001

2.19 (2.05-2.33)

< 0.001

   Other vaccine-preventable conditions

2.13 (1.58-2.86)

< 0.001

1.47 (1.14-1.91)

0.004

Chronic

1.80 (1.74-1.86)

< 0.001

1.82 (1.78-1.87)

< 0.001

   Asthma

3.37 (3.13-3.64)

< 0.001

2.47 (2.30-2.66)

< 0.001

   Congestive heart failure

1.28 (1.19-1.37)

< 0.001

1.71 (1.62-1.81)

< 0.001

   Diabetes and its complications

1.77 (1.68-1.87)

< 0.001

1.47 (1.40-1.53)

< 0.001

   COPD

2.40 (2.22-2.60)

< 0.001

2.64 (2.47-2.83)

< 0.001

   Angina

1.56 (1.48-1.65)

< 0.001

1.66 (1.57-1.74)

< 0.001

   Iron deficiency anaemia

1.18 (1.11-1.27)

< 0.001

1.19 (1.11-1.27)

< 0.001

   Hypertension

2.15 (1.94-2.37)

< 0.001

1.90 (1.73-2.09)

< 0.001

   Nutritional deficiencies*

5.52 (1.91-15.97)

0.002

4.81 (1.43-16.21)

0.011

   Rheumatic heart disease

1.34 (1.06-1.69)

0.015

1.01 (0.80-1.28)

0.917

Acute

2.50 (2.44-2.56)

< 0.001

2.08 (2.04-2.13)

< 0.001

   Dehydration and gastroenteritis

1.94 (1.86-2.02)

< 0.001

1.80 (1.73-1.88)

< 0.001

   Pyelonephritis

2.20 (2.09-2.32)

< 0.001

2.26 (2.15-2.36)

< 0.001

   Perforated/bleeding ulcer

1.39 (1.27-1.52)

< 0.001

1.67 (1.52-1.82)

< 0.001

   Cellulitis

2.13 (2.01-2.25)

< 0.001

1.87 (1.77-1.98)

< 0.001

   Pelvic inflammatory disease

2.57 (2.36-2.79)

< 0.001

1.98 (1.82-2.16)

< 0.001

   Ear, nose and throat infections

2.42 (2.25-2.59)

< 0.001

1.99 (1.85-2.13)

< 0.001

   Dental conditions

1.59 (1.51-1.67)

< 0.001

1.34 (1.27-1.41)

< 0.001

   Appendicitis with generalised peritonitis

1.07 (0.92-1.25)

0.385

0.88 (0.75-1.03)

0.118

   Convulsions and epilepsy

10.67 (9.69-11.75)

< 0.001

6.45 (5.89-7.07)

< 0.001

   Gangrene

1.91 (1.62-2.26)

< 0.001

1.81 (1.56-2.10)

< 0.001

Adverse drug events

2.49 (2.41-2.58)

< 0.001

2.66 (2.58-2.74)

< 0.001

Total PPHs

2.12 (2.07-2.16)

< 0.001

2.06 (2.03-2.09)

< 0.001

Total hospital admissions

2.23 (2.21-2.25)

< 0.001

2.09 (2.08-2.11)

< 0.001

  1. Abbreviations: PPHs = potentially preventable hospitalisations, URR = unadjusted rate ratio, ARR = adjusted rate ratio, COPD = chronic obstructive pulmonary disease.
  2. Unadjusted and adjusted rate ratios of hospitalisation were the second highest for nutritional deficiencies, after convulsions and epilepsy, but there were only 21 cases in MHCs and 10 in non-MHCs during the entire follow up period. Multivariate regression model adjusted for 5-year age group, sex, Indigenous status, level of social disadvantage, level of residential remoteness, physical comorbidities and year at the start of follow up.
  3. The reference group was the comparison cohort, non-MHCs.
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BMC Psychiatry

ISSN: 1471-244X

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