Table 1.

Demographic characteristics of the athletes and controls.

	Athletes (n = 20)	Controls (n = 21)	${\chi }^2$ or t	p value
Age (years)	22.2 ± 2.75	22.62 ± 2.41	0.6794	0.5009a
Sex (female/male)	8/12	9/12	0	>0.9999b
BMI	22.23 ± 4.93	21.85 ± 2.99	0.3060	0.7612a
Education (years)	15.6 ± 2.11	16.62 ± 2.15	1.494	0.1431a
Training time (h/week)	7.13 ± 3.69	NA	NA	NA
Duration (years)	12.15 ± 2.83	NA	NA	NA
Mean FD (mm)	0.06 ± 0.02	0.06 ± 0.02	0.3933	0.6963a

Data are expressed as mean values ± SD; BMI, body mass index; SD, standard deviation; FD, frame displacement.

^ap value obtained by two-sample t-test.

^bp values obtained by Chi-squared test.