Table 2.

Predicted rates of speed improvement at 6, 10 and 17 furlongs determined from model 2 fitted to datasets. Average yearly improvement is expressed in absolute units (yards s−1 year−1) and as a percentage of speed in the first year of analysis (1850 or 1997).

datasetyearsclassesfinishersdistance (furlongs)average predicted change in speed per year (yards sec−1 year−1)average predicted change in speed per year (% of 1850 or 1997 speed)
2.11850–2012elitewinners60.0130.080
100.0100.065
170.0090.060
2.21997–2012elitewinners60.0200.110
100.0040.020
17−0.002−0.009
2.31997–2012eliteall60.0220.124
100.0040.022
170.0030.016
2.41997–2012allwinners60.0110.062
100.0060.037
170.0040.022
2.51997–2012allall60.0150.090
100.0110.065
170.0060.034