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Table 1 Summary of pairwise associations between reason for use and type of supplements used (all athletes who use supplements n = 520)

From: Performance enhancement with supplements: incongruence between rationale and practice

  Maintain strength Enhance endurance Able to train longer Doctor's advice
Creatine 97.076 (< .001) NA 49.140 (< .001) NA
Iron NA 0.230 (.632) NA 35.004 (<.001)
Ginseng NA NA 4.062a (.044) NA
Whey protein 97.823 (.001) NA 31.180 (.001) NA
Caffeine NA 38.761 (.001) 25.192 (.001) NA
Vitamin C NA NA 1.577 (.209) 0.005 (.944)
  1. a expected association from anecdotal effect. Each cell displays the χ2 coefficient and the corresponding p-values in parentheses (NA = no association expected).