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["Additional data file 3A: Characteristics of the samples used from the UK Collaborative Trial of Ovarian Cancer Screening (UKCTOCS).  Statistical significance was tested using a two-sided, Fisher's exact test. The missing values were not included in the analysis."]
["FACTORS",null,"Breast Cancer developed",null,"P value"]
[null,null,"yes","no"]
["Oral Conraceptive Pill use in the past","yes",65,67,1]
[null,"no",54,55]
["Pregnancies < 6 months","yes",27,40,0.113]
[null,"no",91,82]
["Pregnancies > 6 months","yes",102,109,0.439]
[null,"no",17,13]
["Mother breast cancer","yes",16,9,0.142]
[null,"no",103,113]
["Grandmother(s) breast cancer","yes",2,7,0.172]
[null,"no",117,115]
["Sister(s) breast cancer","yes",7,9,0.797]
[null,"no",112,113]
["Aunt(s) breast cancer","yes",11,7,0.336]
[null,"no",108,115]
["Any family member breast cancer","yes",32,29,0.657]
[null,"no",87,93]
["Alcohol units per week","yes",82,64,0.742]
[null,"no",29,20]
["Smoker","yes",46,32,0.0723]
[null,"no",72,84]
[]
["Additional data file 3B:  Statistical significance was tested via a t-test."]
[null,null,"Breast Cancer developed",null,"P value"]
[null,null,"yes","no"]
["Mean BMI (kg/m2)",null,27.33,26.6,0.26]
["Mean Age at Menarche (yrs)",null,12.79,13.11,0.14]
["Mean Age at Menopause (yrs)",null,49.05,48.16,0.31]