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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%