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