Prevalence of comorbidity of chronic diseases in Australia

Table 6 Summary of studies reporting comorbidities with mental health problem/depression.

Comorbidity Study	Study Quality Score/8	Arthritis (%)	Asthma (%)	CVD (%)	Diabetes (%)	Hypertension (%)	Dyslipidemia (%)	Malignancy (%)	Mental problem/ depression (%)
Mental health problem/depression
O'Halloran et al, 2003 [42] ≥ 65 yrs n = 2,976, GP encounters (depression prevalence 10%)	5	27.0 (OA)	-	15.9 (IHD)	12.9	40.9	18.9	23.7	•
NHS 2004–05 [2] ≥ 65 yrs n = 3,212 mental health and behavioural problems^a, self-report all conditions (prevalence 9.5%)	7	30.0	5.28	26.7	6.8	-	-	6.3	•
Hunt et al 2004 [49] ≥ 18 yrs n = 10,241, generalised anxiety disorder diagnosed by composite international diagnostic interview (CIDI) (prevalence 4.5%) depression CIDI	4	-	-	-	-	-	-	-	38.9 (depression)
NHS 2004–05 [2] ≥ 25 yrs n = 17,202 mental health and behavioural problems^a, self-report all conditions (prevalence 12.1%)	7	30.3	14.1	14.0	4.7	-	-	6.3	•
Wilson et al 2003 [50] ≥ 15 yrs n = 382 GP diagnosed depression (Medic-GP database), comorbidities from medical records	5	-	-	-	-	-	-	-	8.9 (anxiety)
National Survey of Mental Health and Wellbeing, 1997 [51] ≥ 18 yrs n = 10,641 mental health problem diagnosed by CIDI (prevalence 12.3%)	7
Affective disorder (prevalence 3.8%)		-	-	-	-	-	-	-	47.3 (anxiety)
Anxiety disorder (prevalence 5.5%)		-	-	-	-	-	-	-	24.5 (affective)

-, not reported; ^aMental and behavioural problems include alcohol and drug, affective, anxiety-related, psychological development, behavioural and emotional, organic mental problems and symptoms and signs involving cognition, perception, emotional state and behaviour.