Factors examined as potential confounders or effect modifiers included age (at breast cancer diagnosis for cases, at time of study enrollment for controls), age at first birth, number of children, birth of a son, history of breastfeeding, miscarriage, abortion, oral contraceptive use, smoking status, age at menarche and number of cell equivalents tested for detection of FMc. (journals.plos.org)
Around the same time of the study just mentioned, two researchers studied forty - nine MZ and eighty - nine DZ pairs, but found no difference in the concordance rates. (personalityresearch.org)
Based on the number of people in the study (135,000) and the length of time of the study period (7.5 years), many people may consider these results to be groundbreaking. (masteringdiabetes.org)