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 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

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