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Table 3 Pairs characteristics

From: A multi-center nested case-control study on hospitalization costs and length of stay due to healthcare-associated infection

Variable

Number of Hospitals

(n = 51)

Number of Pairs

(n = 175)

Ratio of composition

Classification of GDP

 1

4

19

10.86%

 2

23

71

40.57%

 3

11

37

21.14%

 4

13

48

27.43%

Classification of the number of hospital beds

 1

19

29

16.57%

 2

11

47

26.86%

 3

13

49

28.00%

 4

8

50

28.57%