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

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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

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