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Table 1 Characteristics of study sample

From: Association of Mediterranean diet, dietary supplements and alcohol consumption with breast density among women in South Germany: a cross-sectional study

  n* Mean SD Min. Max. Median
Age (at recruitment) (years) 424 53.98 10.50 21.00 84.00 54.00
BMI (at recruitment) (kg/m2) 420 25.23 4.86 17.31 65.76 24.46
Age at menarche (years) 407 13.21 1.49 10.00 19.00 13.00
Age at the first birth (years) 343 25.62 5.10 16.00 45.00 25.00
Number of live births 406 1.70 1.05 00.00 5.00 2.00
   absolute frequency relative frequency    
(n) (%)
Physical activity (at recruitment) 424      
yes   324 76    
no   100 24    
Alcohol consumption (at recruitment) 424      
yes   283 67    
no   141 33    
Smoker (at recruitment) 424      
yes   52 12    
no   372 88    
School education 417      
9 years of school   298 71    
13 years of school   119 29    
HRT (ever) 424      
yes   128 30    
no   296 70    
Use of oral contraceptives (ever) 424      
yes   339 80    
no   85 20    
Mother with history of breast cancer 424      
yes   68 16    
no   356 84    
Menopausal status 424      
premenopausal (< 50)   150 35    
postmenopausal (≥ 50)   274 65    
Breast feeding (ever) 339      
yes   272 80    
no   67 20    
  1. Abbreviations: n, number of observations; SD, standard deviation; BMI, body-mass-index; min., minimum; max, maximum; kg, kilogram; m 2, square meter; HRT, hormone replacement therapy.
  2. *Numbers may not add up to 424 due to missing values.