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Table 2 Multi-level regression analyses for changes in swimming split times across years with correction for multiple finishes for the annual three fastest women and men

From: Performance and sex difference in ultra-triathlon performance from Ironman to Double Deca Iron ultra-triathlon between 1978 and 2013

Distance Sex ß SE (ß) Stand. ß T P
Ironman Female −0.203 0.054 −0.358 −3.777 < 0.001
Double Iron Female −0.215 0.429 −0.062 −0.500 0.619
Triple Iron Female −0.042 0.442 −0.013 −0.096 0.924
Quintuple Iron Female −2.222 60.349 −0.018 −0.037 0.972
Ironman Male −0.338 0.065 −0.451 −5.196 < 0.001
Double Iron Male −0.525 0.321 −0.175 −1.635 0.106
Triple Iron Male −0.180 0.417 −0.049 −0.431 0.667
Quadruple Iron Male −24.133 11.354 −0.558 −2.126 0.059
Quintuple Iron Male 5.382 2.526 0.509 2.131 0.053
Deca Iron Male 0.727 8.419 0.016 0.086 0.932