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. 2017 Nov 16;143(11):1122–1125. doi: 10.1001/jamaoto.2017.1746

Figure 1. Standardized Discharge Ratios For Major Procedures With High and Low Variation Across The United States .

Figure 1.

Data are derived from the 306 hospital referral regions in the United States and based on national Medicare data. Surgical rates were logarithmically transformed and divided by national averages in order to standardize estimates of variation. Thyroidectomy: mean 60/100 000 beneficiaries, interquartile ratio 1.62 (75th percentile divided by 25th percentile), extremal ratio 6.20 (highest rate divided by lowest rate); radical prostatectomy: mean 95/100 000 beneficiaries, interquartile ratio 1.58, extremal ratio 5.58; hip fracture hospitalization: 585/100 000 beneficiaries, interquartile ratio 1.27, extremal ratio 2.18.