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. Author manuscript; available in PMC: 2021 Jun 28.
Published in final edited form as: Ann Thorac Surg. 2020 Feb 24;110(3):962–968. doi: 10.1016/j.athoracsur.2020.01.013

Table 3.

Variation in Case-Mix Adjusted Resource Use Across Hospitals by the Two Methods

Group Hospital Median ($) Hospital 25th–75th percentile ($) Coefficient of Variation (%)
Overall
  Cost-to charge ratio $57,392 48,628 – 67,736 24.9%
Standardized cost $48,696 42,642 – 55,610 19.9%
STAT 1
Cost-to charge ratio $37,246 31,888 – 43,505 23.3%
Standardized cost $31,739 27,834 – 36,191 19.7%
STAT 2
Cost-to charge ratio $52,046 43,801 – 61,843 26.0%
Standardized cost $44,072 38,505 – 50,444 20.2%
STAT 3
Cost-to charge ratio $71,343 60,177 – 84,581 25.6%
Standardized cost $60,732 53,675 – 68,716 18.5%
STAT 4
Cost-to charge ratio $119,940 100,646 – 142,932 26.5%
Standardized cost $102,739 88,932 – 118,689 21.6%
STAT 5
Cost-to charge ratio $196,199 163,936 – 234,811 27.1%
Standardized cost $166,755 140,966 – 197,261 25.3%

The coefficient of variation (%) quantifies the magnitude of between-hospital variability in resource use, with a higher value indicating greater variation (see methods for details). Variability across hospitals appeared slightly less using the standardized cost method vs. the cost-to-charge ratio method both overall and across STAT categories.