Table 3. Comparison of consumption of specific caffeinated beverages and time spent for specific screen media according to the ESS scores.

Variables		ESS scores
		≤ 6 (n = 157)	7–8 (n = 44)	≥ 9 (n = 48)
Consumption of specific caffeinated beverages, cup/day
	Coffee	0.4 ± 0.4	0.4 ± 0.4	0.3 ± 0.3
	Tea	0.3 ± 0.6	0.2 ± 0.5	0.3 ± 0.5
	Soft drink	0.4 ± 0.3†	0.5 ± 0.4*	0.4 ± 0.3†
	Energy drink	0.3 ± 0.3	0.2 ± 0.3	0.2 ± 0.2
	Chocolate/cocoa drink	0.2 ± 0.5†	0.1 ± 0.4†	0.5 ± 0.8*
Time spent for specific screen media, hr/day
	TV	0.7 ± 0.8*,†	0.5 ± 0.5†	1.0 ± 0.9*
	DVD movies	0.4 ± 0.6	0.4 ± 0.5	0.3 ± 0.5
	Computer	1.3 ± 0.7	1.4 ± 0.6	1.4 ± 0.8
	Mobile phone	1.5 ± 0.7†	1.4 ± 0.7†	1.8 ± 0.7*
	Screen games	0.5 ± 0.7	0.3 ± 0.5	0.5 ± 0.7
Total screen time spent, hr/day		4.3 ± 2.0†	3.9 ± 1.2†	5.1 ± 1.9*

^*,†Different marks indicate a statistical difference at p < 0.05 in the post-hoc test using Scheffé's method after taking into account age, smoking experience, alcohol drinking experience, regular physical activity, weight loss attempts, and experience of working for making money.

ESS, Epworth Sleepiness Scale.