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The percentage of physicians in group practices whose compensation was based partly on quality measures increased from 17.6% in 2001 to 20.2% in 2005, according to a report from the Center for Studying Health System Change (HSC). Productivity continues to be the most common measure for determining physician compensation-roughly 70% of physicians are paid based on measures such as gross charges, work relative value units, etc. However, industrywide concern about low-quality medical care has led to increased use of financial incentives to improve quality of care.