After @ months , compared with baseline , mean ( SD ) creatinine-cystatin C-based GFR was -@ ( @ ) , -@ ( @ ) , -@ ( @ ) , and -@ ( @ ) ml/min per @ m ( @ ) in the placebo , eicosapentaenoic acid-docosahexaenoic acid , - linolenic acid , and eicosapentaenoic acid-docosahexaenoic acid plus - linolenic acid groups , respectively .