Men Women Parameter Estimate Standard error 95% CI Estimate Standard error 95% CI P0 6.53 1.24 2.43 6.66 0.53 1.04 a1 19.77 3.18 6.23 30.46 7.76 15.21 a2 0.04 0.00 0.00 0.03 0.00 0.01 t1 1980.68 7.29 14.30 1985.55 11.74 23.01 b1 5.28 1.16 2.27 -8.93 2.16 4.23 b2 -0.18 0.03 0.05 0.18 0.03 0.05 t2 1991.39 0.62 1.22 1994.23 0.72 1.40 Peak after phase 1 26.29 37.12 Peak after phase 2 21.01 28.18 R2 0.9603 0.9472 R2 adjusted 0.9602 0.9471

Table 1: Non-linear regression output for the double logistic models of the men’s and women’s shot put by year.