Table 1.

Descriptive average values between top and non-top countries.

N = 628
	Top countries	Non-top countries
% Swimmers	40.13	59.87
% Males	46.28	53.72
% Females	45.24	54.76
Mean age of best performance in senior	22.70 ± 3.50	22.15 ± 3.70
MA	21.11 ± 3.72	20.83 ± 3.81

“MA” minimum age: age in years in which swimmers involved in this study competed their first world championship competition.