Table 1

Characteristics of study sample
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

Abbreviations: n, number of observations; SD, standard deviation; BMI, body-mass-index; min., minimum; max, maximum; kg, kilogram; m2, square meter; HRT, hormone replacement therapy.

*Numbers may not add up to 424 due to missing values.

Voevodina et al.

Voevodina et al. BMC Public Health 2013 13:203   doi:10.1186/1471-2458-13-203

Open Data