Table 1.

Summary of scales, variables, measure values and analysis values

Scale (composition)	Variable	Measure value	Analysis value
Demographic factors	Age	Years	Constant
	Sex	Male/female	Male=0 and female=1
	Grade/stress about grades	3-point scale*	2 or 3 points=1 and 1 points=0
	Parents’ education status (father/mother)	High school degree or less/college degree/graduate degree	High school degree or less=0, college degree and graduate degree=1
	Socioeconomic and health statuses of parents (economic/health)	3-point scale*	Above average=3 Average=2 Below average=1
	Previous health education on safe drug use	Frequencies	≥2 times=1 and <2 times=0
Perceived health threat	Perceived susceptibility Perceived severity	5-point scale†	4 or 5 points=1 (positive) and ≤3 points=0 (negative)
Likelihood of action	Benefits Harms	5-point scale†	4 or 5 points=1 (positive) and ≤3 points=0 (negative)
Cues to act	Media Recommendation from family members or friends	5-point scale†	4 or 5 points=1 (positive) and ≤3 points=0 (negative)
Caffeine use	Current use of highly caffeinated energy drinks	2-point scale‡	Current use=0, current do not use=1

*More than middle=3, middle=2 and less than middle=1.

†: Strongly agree(5), Agree(4), Undecided(3), Disagree(2) and Strongly disagree(1), ‡: Yes(0) and No(1)