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Table 2 . Comparison of compression depth, percentage of comparison depth, and subject heart-rate increase .

Variable

Compression rate

p value

100 times/minute group

(N = 35)

120 times/minute group

(N = 35)

Compression depth, cm

5.2 ± 0.3

5.4 ± 0.3

0.007

Percentage of compression depth, %

37.1 ± 10.2

18.7 ± 7.2

0.0001

The difference in subject heart-rate increase

22.7 ± 9.7

32.4 ± 8.8

0.0001