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Table 4 Relative percentage of congruent answers by 'ability to train longer' and 'doctors' advice' as rationale for supplement use and supplement used by all athletes who reported the use of nutritional supplements (n = 520)

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

   Able to train longer Doctors' advice
   Yes   No   Yes   No  
Creatine Yes 51 73.9% 137 30.4%     
  No 18 26.1% 314 69.6%     
   69 100.0% 451 100.0%     
Iron Yes      64 50.8% 91 23.1%
  No      62 49.2% 303 76.9%
       126 100.0% 394 100.0%
Ginseng Yes 10 14.5% 33 7.3%     
  No 59 85.5% 418 92.7%     
   69a 100.0% 451a 100.0%     
Whey protein Yes 41 59.4% 118 26.2%     
  No 28 40.6% 333 73.8%     
   69 100.0% 451 100.0%     
Caffeine Yes 33 47.8% 91 20.2%     
  No 36 52.2% 360 79.8%     
   69 100.0% 451 100.0%     
Vitamin C Yes 53 76.8% 313 69.4% 89 70.6% 277 70.3%
  No 16 23.2% 138 30.6% 37 29.4% 117 29.7%
   69 100.0% 451 100.0% 126 100.0% 394 100.0%
  1. a expected association from anecdotal effect.