Table 5.

Coefficients and standard errors from multivariate regression models for running speed of the annual fastest runners for each calendar year

	C	SE	P-value
Intercept	−44.47	9.77	<0.001
Sex (female)	−1.51	0.15	<0.001
Year	0.026	0.0048	<0.001
Distance
3,100 miles	−6.38	0.35	<0.001
1,000 miles	−5.55	0.25	<0.001
100 miles	−1.60	0.16	<0.001
Age
Linear	0.019	0.015	0.193
Squared	0.002	0.001	0.193
Interaction sex × distance
Female × 3,100 miles	0.698	0.660	0.292
Female × 1,000 miles	0.993	0.311	0.002
Female × 100 miles	0.148	0.022	0.460
Interaction distance × age linear
3,100 miles × age	0.057	0.167	0.734
1,000 miles × age	−0.009	0.020	0.633
100 miles × age	0.006	0.017	0.702
Interaction distance × age2
3,100 miles × age2	−0.006	0.010	0.535
1,000 miles × age2	−0.003	0.002	0.067
100 miles × age2	−0.002	0.002	0.352
Interaction sex × age
Female × age	−0.014	0.015	0.325
Interaction sex × age2
Female × age2	0.0007	0.0012	0.560

Abbreviations: C, coefficient; SE, standard error.