Serum ferritin concentration was reduced by 44 % [ 95 % confidence interval ( CI ) 8-82 % , P = 0.021 ] during the venesection periods , the maximal oxidation velocity was decreased by 20 % ( 95 % CI 3-30 % , P = 0.032 ) , and the lag time to start of oxidation was lengthened ( oxidation resistance increased ) by 33 % ( 95 % CI 1-64 % , P = 0.036 ) .
