Table 4.

Non-parametric comparisons of the gender effects (Mann-Whitney-U test), age group and seasonal effects (Kruskal-Wallis test).

Independent Variable	Dependent Variable		P
Season	q1—get up time	χ2 =3.55	0.314
	q2—tiredness in the morning	χ2 =1.62	0.654
	q3—bed time	χ2 =56.32	<0.001
	q4—peak performance	χ2 =4.84	0.184
	q5—global assessment	χ2 =5.17	0.159
Gender	q1—get up time	Z=2.43	0.015
	q2—tiredness in the morning	Z=3.28	0.001
	q3—bed time	Z=−15.67	<0.001
	q4—peak performance	Z=−6.20	<0.001
	q5—global assessment	Z=−9.36	<0.001
Age Group	q1—get up time	χ2 =1444.9	<0.001
	q2—tiredness in the morning	χ2 =525.2	<0.001
	q3—bed time	χ2 =1157.1	<0.001
	q4—peak performance	χ2 =476.5	<0.001
	q5—global assessment	χ2 =790.5	<0.001