Changes in sex difference in swimming speed in finalists at FINA World Championships and the Olympic Games from 1992 to 2013

Table 3 Multi-level regression analysis for change in swimming speed for the world champions in freestyle, breaststroke, backstroke, butterfly and individual medley with correction for multiple participations and age of the athletes

Stroke	Sex	Distance (m)	β	SE ( β)	Stand. β	T	p
Freestyle	Male	50	0.006	0.001	0.846	3.997	0.007
		100	0.004	0.001	0.768	3.293	0.017
		200	0.004	0.002	0.846	2.797	0.310
		400	0.001	0.001	0.259	0.672	0.527
		800	0.002	0.001	0.593	1.754	0.130
		1500	0.001	0.001	0.514	1.478	0.190
	Female	50	0.004	0.002	0.693	2.206	0.070
		100	0.004	0.001	0.755	2.747	0.033
		200	0.003	0.001	0.694	2.844	0.029
		400	0.005	0.002	1.282	2.335	0.058
		800	0.003	0.000	0.985	7.017	< 0.001
		1500	0.003	0.001	0.906	4.285	0.013
Breaststroke	Male	100	0.005	0.001	1.126	6.187	0.001
		200	0.004	0.000	0.926	9.188	< 0.001
	Women	100	0.005	0.001	0.943	7.108	< 0.001
		200	0.004	0.000	0.926	9.188	< 0.001
Backstroke	Male	100	0.006	0.001	1.003	8.373	< 0.001
		200	0.005	0.001	0.854	3.346	0.016
	Women	100	0.004	0.001	0.800	3.970	0.007
		200	0.003	0.001	0.730	2.646	0.038
Butterfly	Male	100	0.006	0.002	0.827	3.590	0.011
		200	0.003	0.001	0.687	2.049	0.086
	Women	100	0.004	0.000	0.905	9.760	< 0.001
		200	0.003	0.001	0.687	2.049	0.086
Individual medley	Male	200	0.006	0.001	1.037	4.527	0.004
		400	0.002	0.001	0.761	2.697	0.036
	Women	200	0.003	0.001	0.754	2.930	0.026
		400	0.003	0.001	0.902	4.589	0.004

ISSN: 2052-1847