9. Resource use and costs.

Study	Condition	No. of participants	Timing of outcome measurement	Resource use	Results as reported
Battersby 2007	Various	1703*	12 months	Primary care, medications, hospital admissions	No reduction in service use, no cost savings
Katon 2010a	Depression + diabetes/CHD	214	24 months	Health plan accounting records, QALYs	0.335 additional QALYs for intervention group and lower outpatient costs
Wilson 2010	Asthma	408	12 months	Medications	Significant changes in medication use; no assessment of cost effectiveness

* This figure includes 8 sub‐regional studies, 4 of which used geographic controls and were not randomised.
 CHD: coronary heart disease; QALY: quality‐adjusted life year