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. Author manuscript; available in PMC: 2013 Feb 9.
Published in final edited form as: Arch Intern Med. 2012 Jan 23;172(2):163–170. doi: 10.1001/archinternmed.2011.722

Figure 2. Referral Rates in the US for Office-Based Physicians, 1993–2009, by Specialty.

Figure 2

Results in this figure from the NAMCS dataset only (physician specialty data not available in NHAMCS). Data not available from 1995–1998 on referral rates. Error bars show 95% confidence intervals.