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. Author manuscript; available in PMC: 2015 Aug 5.
Published in final edited form as: JAMA Intern Med. 2015 Aug 1;175(8):1352–1359. doi: 10.1001/jamainternmed.2015.2081

Figure.

Figure

Rate of Testing in US Ambulatory Preoperative Visits Compared With General Medical Examinations, 1997-2010

The vertical line at year 2002 indicates the cutoff for the comparison of change in testing rates for preoperative visits to general medical examinations. Data points represent combined data for 2-year increments (eg, 1997-1998, 1999-2000), but cardiac stress testing rates were averaged for 3-year instead of 2-year intervals (except in 1997-1998) to improve statistical reliability. ECG indicates eletrocardiography.