Table 4.

Expected values of average compression depth (mm) with the duty cycle of 50% and the average compression rate of 120/min, according to the quartiles of body weight in each sex of rescuer, calculated from the regression equation

Quartile	Male	Female
Quartile 1	48.4	33.8
Quartile 2	49.1	34.9
Quartile 3	51.3	35.9

Regression equation: average compression depth=-0.399×[duty cycle]+0.073× [average compression rate]+0.358×[body weight]+8.016×[male sex]+1.048× [self assessed physical strength]+20.090. Quartile values used in the calculation: quartile 1, 66 for male and 49 for female; quartile 2, 68 for male and 52 for female; quartile 3, 74 for male and 55 for female. Body weight used in the calculation: 68 for male and 52 for female. Self assessed physical strength used in the calculation: 7.5 for male and 7 for female. Duty cycle used for calculation: 50% in both sexes.