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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

From: A survey of energy drink consumption patterns among college students

   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