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Table 4 Multi-level regression analyses for changes in running 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 −1.228 0.115 −0.734 −10.647 < 0.001
Double Iron Female 1.744 1.768 0.122 0.986 0.328
Triple Iron Female 18.694 3.338 0.603 5.600 < 0.001
Quintuple Iron Female −64.111 95.465 −0.318 −0.672 0.539
Ironman Male −1.310 0.167 −0.606 −7.834 < 0.001
Double Iron Male −3.673 0.709 −0.490 −5.182 < 0.001
Triple Iron Male −0.261 1.600 −0.019 −0.163 0.871
Quadruple Iron Male −19.733 30.924 −0.198 −0.638 0.538
Quintuple Iron Male 46.406 17.218 0.599 2.695 0.018
Deca Iron Male 15.199 30.200 0.095 0.503 0.619