Many of the projects that Derek King has been involved in for the PSSRU has been quantitative analysis particularly in the topic of mental health and long term care. This work has looked at both the costs and outcomes of various interventions and particular characteristics of individuals in the studies. This work has aimed to show whether interventions in health and social care are cost-effective. A recent project has involved looking at people providing informal care for those with dementia, and in particular has tested whether a new measure that looks at the dependence of the individual with dementia is sensitive to costs in terms of medical services used, medication, social care services received and informal care.