Table 4

Side effects by maximum number of energy drinks consumed for any of six situations in an average month for the current semester among college energy drink users

Maximum energy drink intake

Parameter

n

1

2

≥3

χ²

P (yes versus no)

Weekly jolt and crash episodes

253

19.10

< .01

% of yes responders

74

12

31

57

% of no responders

159

40

25

35

Ever having heart palpitations

215

4.77

.09

% of yes responders

40

20

22

58

% of no responders

175

34

27

39

Ever having headaches

232

1.24

.54

% of yes responders

51

27

24

49

% of no responders

181

33

27

40

Malinauskas et al. Nutrition Journal 2007 6:35   doi:10.1186/1475-2891-6-35