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Table 5 Multi-level regression analyses for change in running speed across years for the annual fastest women and men after correction for multiple finishes, multiple participation and age of athletes with multiple finishes

From: Age and ultra-marathon performance - 50 to 1,000 km distances from 1969 – 2012

Distance β SE ( β) Stand.β T p
Annual fastest men
50 km 0.105 0.028 0.547 3.816 <0.0001
100 km 0.084 0.014 0.696 5.953 <0.0001
200 km −0.125 0.050 −0.741 −2.469 0.0057
1,000 km −0.013 0.016 −0.217 −0.822 0.425
Annual fastest women
50 km 0.191 0.024 0.870 7.867 <0.0001
100 km 0.095 0.009 0.728 10.850 <0.0001
200 km −0.168 0.062 −0.892 −2.701 0.0074
1,000 km −0.046 0.022 −0.636 −2.084 0.076