RESULTS	After 12 months , 35 patients ( 65 % ) treated with acetylcysteine and 30 ( 54 % ) given placebo were still alive ( hazard ratio , 0.74 in the acetylcysteine group relative to the placebo group ; 95 % confidence interval , 0.41 to 1.33 ; log-rank test , P = .31 ) .\