On polar plot analysis , there were no differences between acipimox and placebo for mean values of stress defect extent ( 97 + / - 16.1 vs 96.5 + / - 18.8 pixels ) , defect severity ( 532.2 + / - 120 vs 537 + / - 133.9 standard deviations [ SDs ] ) , for defect reversibility ( 61.7 + / - 18 vs 55.4 + / - 15.3 SDs ) , and percentage reversibility ( 21.2 % + / - 5.5 % vs 19.2 % + / - 5.8 % ) , respectively .
