Table 5. Mechanistic analysis of the effect of the 15 m start time, mean total turn time (5 m before to 10 m after wall contact), mean free-swimming velocity, mean stroke rate, and mean distance per stroke on Individual Medley (IM) race time as the dependent variable using stepwise regression analysis with all participants of each event.
Regression model P-value Regression coefficients
Entries R square F-value Beta T-value P-value
Males 100 m IM Turn time [s] 70 0.98 F(3 | 66) = 1013 P < 0.001 0.53 T = 11 P < 0.001
Swim velocity [m/s] -0.34 T = -12 P < 0.001
Start time [s] 0.19 T = 5 P < 0.001
200 m IM Turn time [s] 59 0.99 F(3 | 55) = 3055 P < 0.001 0.65 T = 32 P < 0.001
Swim velocity [m/s] -0.36 T = -21 P < 0.001
Start time [s] 0.04 T = 3 P = 0.009
400 m IM Turn time [s] 26 0.97 F(2 | 23) = 313 P < 0.001 0.78 T = 16 P < 0.001
Swim velocity [m/s] -0.29 T = -6 P < 0.001
Females 100 m IM Turn time [s] 73 0.99 F(3 | 69) = 3181 P < 0.001 0.63 T = 26 P < 0.001
Swim velocity [m/s] -0.28 T = -15 P < 0.001
Start time [s] 0.14 T = 7 P < 0.001
200 m IM Turn time [s] 46 0.99 F(3 | 42) = 1858 P < 0.001 0.57 T = 19 P < 0.001
Swim velocity [m/s] -0.42 T = -18 P < 0.001
Start time [s] 0.06 T = 3 P = 0.006
400 m IM Turn time [s] 36 1.00 F(2 | 33) = 3791 P < 0.001 0.58 T = 27 P < 0.001
Swim velocity [m/s] -0.46 T = -21 P < 0.001