Table 4

Logistic regression models of factors associated with diabetes in people with severe mental illness attending a multidisciplinary service

VariableUnivariateMultivariate
OR (95% CI)OR (95% CI)
Age (per 5-year increase)1.2 (1.1 to 1.3)*1.3 (1.2 to 1.4)*
Gender
 MaleReferenceReference
 Female0.9 (0.7 to 1.1)0.8 (0.6 to 1.1)
BMI
 NormalReference
 Overweight2.6 (1.4 to 4.5)*
 Obese4.6 (2.8 to 7.8)*
Waist circumference
 NormalReference
 Abnormal4.6 (2.5 to 8.3)*
Waist:height ratio
 NormalReferenceReference
 Abnormal5.5 (2.9 to 10.7)*4.5 (2.2 to 9.2)*
Family history of diabetes
 NoReferenceReference
 Yes2.0 (1.5 to 2.6)*2.0 (1.5 to 2.8)*
Psychiatric diagnosis
 SchizophreniaReference
 Schizoaffective0.8 (0.5 to 1.3)
 Bipolar0.6 (0.4 to 0.9)*
 Depression0.9 (0.5 to 1.6)
 Other psychosis0.2 (0.1 to 0.5)*
 All others0.4 (0.2 to 1.0)
Father’s ethnicity
 Low-risk group (Mediterranean/Caucasian)Reference
 Aboriginal/Torres Strait Islander1.7 (0.8 to 3.7)
 African–American1.7 (0.5 to 5.4)
 Asian0.9 (0.7 to 1.3)
 Indian2.8 (1.4 to 5.5)*
 Middle Eastern1.7 (1.0 to 2.8)
 Other high risk0.6 (0.2 to 1.8)
 Pacific Islander1.4 (0.7 to 2.7)
Mother’s ethnicity
 Low-risk group (Mediterranean/Caucasian)ReferenceReference
 Aboriginal/Torres Strait Islander3.4 (1.8 to 6.6)*4.0 (1.8 to 8.5)*
 African–American1.9 (0.6 to 6.4)3.6 (0.9 to 14.7)
 Asian0.9 (0.7 to 1.4)1.3 (0.9 to 2.0)
 Indian2.3 (1.2 to 4.6)*3.5 (1.6 to 7.5)*
 Middle Eastern1.8 (1.1 to 3.1)*1.9 (1.1 to 3.4)*
 Other high risk0.4 (0.1 to 1.3)0.4 (0.09 to 1.8)
 Pacific Islander1.4 (0.7 to 2.5)1.8 (0.9 to 3.7)
Dyslipidemia
 NoReference
 Yes1.6 (1.0 to 2.8)
Alcohol risk
 Low riskReference
 Risky0.9 (0.4 to 2.2)
 High risk0.4 (0.2 to 0.7)*
Smoking
 NeverReference
 Previous1.4 (0.9 to 2.0)
 Current1.0 (0.8 to 1.4)
Vegetable intake ≥5 serves
 AdequateReference
 Inadequate1.7 (0.8 to 3.5)
Exercise level
 SedentaryReference
 Minimal active0.7 (0.5 to 1.1)
 Lightly exercise0.7 (0.5 to 0.9)*
 Moderately active0.5 (0.3 to 0.8)*
 Extra/very activeNot estimable
Antipsychotic use
 Clozapine±other antipsychotic1.5 (1.1 to 2.0)*1.7 (1.2 to 2.4)*
 Olanzapine±other antipsychotic0.6 (0.4 to 0.8)*0.5 (0.3 to 0.8)*
 Other antipsychotic onlyReferenceReference
 No antipsychotic medication0.8 (0.5 to 1.3)1.2 (0.7 to 2.2)
  • *P<0.05.

  • BMI, body mass index.