An approach to estimate between- and within-group correlation coefficients in multicenter studies: plasma carotenoids as biomarkers of intake of fruits and vegetables

Ferrari, PAl-Delaimy, WKSlimani, NBoshuizen, HCrivmRoddam, AOrfanos, PSkeie, GRodriguez-Barranco, MThiebaut, AJohansson, GPalli, DBoeing, HOvervad, KRiboli, E2025-03-182025-03-1820051609329010.1093/aje/kwi242https://rivm.openrepository.com/handle/10029/640735An approach to estimate between- and within-group correlation coefficients in multicenter studies: plasma carotenoids as biomarkers of intake of fruits and vegetablesArticleAm J Epidemiol 2005; 162(6):591-82025-03-18