Total
(n = 132)
Group 1
(n = 76)
Group 2
(n = 56)
P-value/χ2; d.f.; P-value
N (%) N (%) N (%)
Gender
Male 84 (63.6) 50 (65.8) 34 (60.7) 0.549
Female 48 (36.4) 26 (34.2) 22 (39.3)
Training duration (years)
< 5 26 (19.7) 24 (31.6)b 2 (3.6)b χ2 = 69.6; d.f. = 2;
5 - 10 58 (43.9) 47 (61.8)c 11 (19.6)c P < 0.001a
> 10 48 (36.4) 5 (6.6)d 43 (76.8)d b,c,d P < 0.001a
Hours spent per week in a swimming pool (h)
< 4 28 (21.3) 11(14.5)b 17 (30.4)b χ2 = 6.353; d.f. = 2;
4 - 6 25 (18.9) 13(17.1) 12 (21.4) P = 0.042a
> 6 79 (59.8) 52 (68.4)c 27 (48.2)c b,c P < 0.03a

aStatistically significant, Chi-square test.
χ2 = Chi-square test; d.f. = degree of freedom.