There was some evidence of a differential effect ( nominal interaction p = @ ) for a prespecified comparison : Intensive lifestyle intervention was associated with a relative mean benefit for composite cognitive function of @ ( @ % confidence interval : @ , @ ) SDs among individuals with body mass index less than @ kg/m ( @ ) at baseline compared with a relative mean deficit of @ ( -@ , @ ) SDs among individuals with body mass more than or equal to @ kg/m ( @ ) .