Table 2.

Multi-level regression analyses for change in running speed over time (Model 1) with correction for multiple finishes (Model 2) and with correction for multiple finishes and age of competitors with multiple finishes (Model 3) for the annual fastest and annual ten fastest women and men.

Distance	Model	β	SE (β)	Stand. β	T	p-value
Annual fastest men
50 miles	1	0.004	0.008	0.071	0.449	0.656
	2	0.004	0.008	0.071	0.449	0.656
	3	0.002	0.009	0.046	0.279	0.782
100 miles	1	0.064	0.013	0.620	4.746	<0.001
	2	0.064	0.013	0.620	4.746	<0.001
	3	0.052	0.015	0.506	3.573	0.001
200 miles	1	0.665	0.701	0.688	0.948	0.517
	2	0.665	0.701	0.688	0.948	0.517
	3	0.053	0.103	0.460	0.518	0.696
1,000 miles	1	-0.069	0.028	-0.525	-2.467	0.025
	2	-0.069	0.028	-0.525	-2.467	0.025
	3	-0.060	0.033	-0.458	-1.797	0.093
3,100 miles	1	0.019	0.017	0.424	1.147	0.295
	2	0.019	0.017	0.424	1.147	0.295
	3	0.024	0.014	0.532	1.749	0.141
Annual fastest women
50 miles	1	0.038	0.010	0.552	3.801	0.001
	2	0.038	0.010	0.552	3.801	0.001
	3	0.038	0.010	0.554	3.734	0.001
100 miles	1	0.047	0.011	0.612	4.448	<0.001
	2	0.047	0.011	0.612	4.448	<0.001
	3	0.047	0.011	0.608	4.363	<0.001
1,000 miles	1	-0.008	0.011	-0.225	-0.764	0.461
	2	-0.008	0.011	-0.225	-0.764	0.461
	3	-0.007	0.012	-0.182	-0.537	0.603
3,100 miles	1	0.018	0.019	0.388	0.942	0.390
	2	0.018	0.019	0.388	0.942	0.390
	3	0.077	0.041	1.678	1.906	0.129
Annual ten fastest men
50 miles	1	0.003	0.002	0.071	1.443	0.150
	2	0.003	0.002	0.071	1.443	0.150
	3	0.003	0.002	0.069	1.397	0.163
100 miles	1	0.044	0.003	0.575	13.102	<0.001
	2	0.044	0.003	0.575	13.102	<0.001
	3	0.041	0.003	0.538	12.107	<0.001
3,100 miles	1	-0.030	0.030	-0.188	-1.014	0.319
	2	-0.030	0.030	-0.188	-1.014	0.319
	3	-0.028	0.029	-0.171	-0.964	0.343
Annual ten fastest women
50 miles	1	0.045	0.003	0.613	13.829	<0.001
	2	0.045	0.003	0.613	13.829	<0.001
	3	0.046	0.003	0.616	13.794	<0.001
100 miles	1	0.046	0.003	0.619	14.258	<0.001
	2	0.046	0.003	0.619	14.258	<0.001
	3	0.046	0.003	0.618	14.323	<0.001