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Table 3 Multiple linear regression analysis of swimming performance, i.e. FINA points, as dependent variable and competition (comp.) age [years], relative age [month of birth], and chronological (chronol.) age [years] as predictors with standardized (beta_i) and unstandardized (b_i) regression coefficients in female swimmers

From: Competition age: does it matter for swimmers?

Regression model   Regression coefficients
n R2 F p   beta_i b_i t_i p
All events Comp. age 0.34 22.9 71 < 0.001
39,572 0.20 F(3|39568) = 3361 < 0.001 Relative age 0.09 4.5 21 < 0.001
     Chronol. age 0.18 5.3 37 < 0.001
Butterfly Comp. age 0.21 12.2 35 < 0.001
26,925 0.28 F(3|26921) = 3436 < 0.001 Relative age 0.04 1.9 8 < 0.001
     Chronol. age 0.38 16.3 63 < 0.001
Backstroke Comp. age 0.25 15.9 42 < 0.001
26,136 0.28 F(3|26132) = 3456 < 0.001 Relative age 0.06 2.4 10 < 0.001
     Chronol. age 0.35 14.0 58 < 0.001
Breaststroke Comp. age 0.28 17.0 45 < 0.001
23,676 0.26 F(3|23672) = 2754 < 0.001 Relative age 0.04 1.8 8 < 0.001
     Chronol. age 0.31 10.8 50 < 0.001
Freestyle Comp. age 0.32 20.3 64 < 0.001
36,037 0.26 F(3|36033) = 4184 < 0.001 Relative age 0.06 2.8 13 < 0.001
     Chronol. age 0.27 9.3 54 < 0.001
Individual medley Comp. age 0.14 7.4 18 < 0.001
18,263 0.25 F(3|18259) = 2070 < 0.001 Relative age 0.06 2.4 10 < 0.001
     Chronol. age 0.40 17.4 53  < 0.001
50 m Freestyle Comp. age 0.33 18.6 62 < 0.001
31,906 0.29 F(3|31902) = 4319 < 0.001 Relative age 0.03 1.1 5 < 0.001
     Chronol. age 0.30 10.2 56 < 0.001
100 m Freestyle Comp. age 0.24 14.2 42 < 0.001
29,808 0.32 F(3|29804) = 4583 < 0.001 Relative age 0.04 1.6 7 < 0.001
     Chronol. age 0.39 16.6 69 < 0.001
200 m Freestyle Comp. age 0.20 11.4 28 < 0.001
21,365 0.26 F(3|21361) = 2431 < 0.001 Relative age 0.05 2.2 8 < 0.001
     Chronol. age 0.37 16.1 53 < 0.001
400 m Freestyle Comp. age 0.26 14.4 32 < 0.001
14,646 0.11 F(3|14642) = 595 < 0.001 Relative age 0.08 3.3 10 < 0.001
     Chronol. age 0.10 3.0 12 < 0.001
800 m Freestyle Comp. age 0.25 12.4 22 < 0.001
8104 0.07 F(3|8100) = 215 < 0.001 Relative age 0.08 3.3 8 < 0.001
     Chronol. age − 0.13 − 2.7 − 12 < 0.001
1500 m Freestyle Comp. age 0.19 8.8 14 < 0.001
5654 0.05 F(3|5650) = 89 < 0.001 Relative age 0.06 2.4 5 < 0.001
     Chronol. age − 0.13 − 3.3 − 10 < 0.001