Serum PTX3 concentrations , body mass index ( BMI ) , waist circumference ( WC ) and fat depots , as quantified by dual-energy X-ray absorptiometry and magnetic resonance imaging , were assessed in three community-based cohorts : ULSAM , n = 790 , mean age 78 years ; PIVUS , n = 1003 , mean age 70 years , women 50 % ; and the NORDIET-trial , n = 86 , mean age 53 years , women 63 % .