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Table 1 Personal and tumor characteristics of 264 ovarian cancer cases and 625 controls in the Polish Ovarian Cancer Study.

From: Ovarian cancer risk and common variation in the sex hormone-binding globulin gene: a population-based case-control study

  Cases* N = 264 Controls* N = 625 P**
Study site, N %
   Warsaw 177 67% 423 68% 0.85
   Lodz 87 33% 202 32%  
Age, mean SD in years 56.3 10.8 56.1 10.8 0.83
No. of full-term births, N %
   Nulliparous 50 19% 79 13% <0.0001
   1 101 38% 176 28%  
   2 94 36% 273 44%  
   ≥ 3 19 7% 97 16%  
Number of ovulatory cycles, mean SD 410.9 71.1 398.1 81.3 0.03
Use of oral contraceptive, N %
   Never 245 94% 556 90% 0.08
   Ever 16 6% 60 10%  
Currently having menstrual periods, N %
   No 182 71% 401 66% 0.40
   Yes 75 29% 203 34%  
   Unclear 7 3% 20 3%  
Use of oral hormone replacement therapy among post-menopausal women
   Never 146 81% 325 82%  
   Ever 35 19% 70 18% 0.15
Family history of breast or ovarian cancer in first-degree relatives, N %
   No 210 80% 553 88% 0.001
   Breast cancer only 26 10% 24 4%  
   Ovarian cancer only 26 10% 40 6%  
   Both 2 1% 8 1%  
Tumor Characteristics
Histology, N (%)
   Serous 118 45%    
   Mucinous 26 10%    
   Endometrioid 58 22%    
   Clear cell 14 5%    
   Mixed 18 7%    
   Others or unclassified 30 11%    
Stage, N % distant 110 62%    
   Not staged or missing 86     
Grade of differentiation, N %
   Well 21 13%    
   Moderate 59 35%    
   Poor 88 52%    
   Missing 96     
  1. * Differences between the total number of cases and controls and frequencies shown in the table are due to missing data.
  2. ** P values for categorical variables are based on chi squared tests, and on t-tests for continuous variables.