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Table 2 Crude rate, direct standardized rate (DSR) and measures of variation

From: Regional variation in coronary angiography rates: the association with supply factors and the role of indication: a spatial analysis

 

Cases

Cases without MI

Cases with MI

Crude data

Number of CAs

425,163

349,621

75,542

Crude rate per 10,000 population

101.86

83.76

18.10

Age-sex DSR in 401 districts per 10,000 population

Median

101.67

82.82

17.41

Mean (SD)

102.69 (25.98)

84.32 (24.18)

17.61 (3.44)

Min

46.79

27.08

9.58

Max

229.19

210.62

33.77

Measures of variation

COV

25.29

28.68

19.53

SCV

6.44

8.26

3.37

  1. CA, coronary angiography; COV, coefficient of variation; DSR, direct standardized rate; MI, myocardial infarction; SCV, systematic component of variation; SD, standard deviation