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health model capitation payment risk-adjusted capitation payments survey information percent risk-adjusted person insurer sickness funds dcg model group insurance expenditure sickness adjuster cream van vliet dutch health status profit admission capitation model research member risk adjusters vliet survey information status system health insurance market netherland hospital formula variable hospitalization health survey information selection healthcare service reform result capitation payments survey variables health survey accuracy difference provider health economics consumer premium guilder dcg models risk-adjusted capitation payment subgroups variance newhouse market base year dcg adjusters healthcare expenditures capitation models panel data disability hospital admission day case treatment community-rated regulator health services research health insurance system utilization table health care reforms risk adjustment formula health care expenditures sickness fund hospital admissions government