Among the polyphenol subclasses , stilbenes and lignans were significantly associated with reduced all-cause mortality ( HR = 0.48 ; 95 % CI 0.25 to 0.91 ; P for trend = 0.04 and HR = 0.60 ; 95 % CI 0.37 to 0.97 ; P for trend = 0.03 , respectively ) , with no significant associations apparent in the rest ( flavonoids or phenolic acids ) .