Table 2.

2001 and 2011 Adult Primary Care Physician Workforce in the United States

	Among 6,542 Primary Care Service Areas
	U.S. Average	5th Percentile	25th Percentile	Median	75th Percentile	95th Percentile	Interquartile Ratio
Primary care physicians per 10,000 populationa
2001	4.8	0.0	2.1	3.6	5.1	8.4	2.5
2011	5.3	0.0	1.9	3.7	5.4	9.1	2.8
Difference	0.5	−3.5	−0.8	0.02	1.1	3.6	1.9
Medicare primary care full‐time equivalents per 10,000 beneficiariesb
2001	6.6	4.5	5.7	6.5	7.4	9.0	1.3
2011	8.2	4.4	6.7	7.8	8.9	10.8	1.3
Difference	1.6	−2.1	0.4	1.4	2.2	3.7	1.8

^aAge–sex‐adjusted office‐based American Medical Association Masterfile clinically active primary care physicians per 10,000 population.

^bAge–sex–race‐adjusted office‐based primary care full‐time equivalents per 10,000 of study beneficiaries.