Journal of Physiological Anthropology

Table 2 Descriptive results of chronotype scores among athletes by different sleep symptoms and habits

From: Chronotype characteristics of professional athletes in China: a comprehensive descriptive study

		n	M	SD
Sleep breathing disorders	Absent	721	6.03	1.82
Sleep breathing disorders	Present	212	6.10	1.92
Travel-related sleep issues	Absent	481	6.16	1.79
Travel-related sleep issues	Present	452	5.92	1.89
Nap frequency	Almost every training day	620	6.02	1.83
Nap frequency	Not every training day^a	313	6.09	1.87
Caffeine intake	Essentially no intake	619	6.27	1.84
Caffeine intake	Intake^b	314	5.60	1.76
Electronic device use	Every training day	604	5.69	1.82
Electronic device use	Not every training day^c	329	6.70	1.69

Note: ^aIncluding “three or four times per week” (n = 236), “once or twice per week” (n = 51), and “none” (n = 26). ^bIncluding “1–2 cans per day” (n = 269), “3 cans per day”(n = 35), “ 4 cans per day” (n = 7), and “5 cans per day” (n = 3). ^cIncluding “not at all (n = 78),” “1 − 3 times per week” (n = 150), and “4 − 6 times per week” (n = 101)

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ISSN: 1880-6805

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