Table 2.

SDS categories by gender, sports type, sports level, phase of the season, sports category, chronotype, sleep disturbance when travelling, performance issue when travelling and sleep-disordered breathing.

	None		Mild		Moderate		Severe		p-value (Cramer's V)
	n	%	n	%	n	%	n	%
All Athletes	149	37.8%	189	48.0%	45	11.4%	11	2.8%
Gender									0.79 (0.05)
Male	74	18.8%	87	22.1%	22	5.6%	4	1.0%
Female	75	19.0%	102	25.9%	23	5.8%	7	1.8%
Sports Type									0.40 (0.09)
Team sports	65	16.5%	74	18.8%	18	4.6%	7	1.8%
Individual sports	84	21.3%	115	29.9%	27	6.9%	4	1.0%
Sports Level									0.54 (0.08)
Master athletes	33	8.4%	40	10.2%	12	3.0%	3	0.8%
National level of athletes	74	18.8%	93	23.6%	15	3.8%	6	1.5%
Second-level athletes	42	10.7%	56	14.2%	18	4.6%	2	0.5%
Phase of Season									0.75 (0.06)
Pre-season	71	18.0%	87	22.1%	18	4.6%	4	1.0%
Off-season	78	19.8%	102	25.9%	27	6.9%	7	1.8%
Chronotype									< 0.001 (0.24)
Morning and Intermediate type	119	30.2%	140	35.5%	29	7.4%	2	0.5%
Evening-type	30	7.6%	49	12.4%	16	4.1%	9	2.3%
Sleep disturbance when travelling									< 0.001 (0.26)
Have sleep disturbance	65	16.5%	122	31.0%	37	9.4%	8	2.0%
No sleep disturbance	84	21.3%	68	17.0%	8	2.0%	3	0.8%
Performance issue when travelling									< 0.001 (0.27)
Have performance issue	43	10.9%	98	24.9%	28	7.1%	2	0.5%
No performance issue	106	26.9%	91	23.1%	17	4.3%	9	2.3%
Sleep-disordered breathing									0.90 (0.04)
Have sleep-disordered breathing	36	9.1%	49	12.4%	10	2.5%	2	0.5%
No sleep-disordered breathing	113	28.7%	141	35.5%	35	8.9%	9	2.3%

Abbreviation: SDS, Sleep Difficulty Score.