Table 3.

Expected values of average compression depth (mm) with the duty cycle of 50%, according to the rate of chest compressions and the sex of rescuer, calculated from the regression equation

Rate of chest compression (compression/min)	Male	Female
100	47.7	33.4
110	48.4	34.1
120	49.1	34.9
130	49.9	35.6
140	50.6	36.3

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. 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.