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Table 1 Description of the study population

From: Diet and body constitution in relation to subgroups of breast cancer defined by tumour grade, proliferation and key cell cycle regulators

Factor (number of individuals for whom information was available) Incident breast cancer (n = 440)
Age at baseline (years; 440) 57.2 (7.1)
Education (439) 70
   O-level college 6
   A-level college university 24
Type of occupation (431)
   Manual worker 34
   Nonmanual worker 59
   Employer/self-employed 7
Married/cohabiting (440)
   No 34
   Yes 66
Age at menarche (years; 440)
   ≤12 22
   >12 to <15 52
   ≥15 26
Parity (number of children; 426)
   0 13
   1 20
   2 44
   3 18
   ≥4 5
Age at first childbirth (years; 440)
   Nullipara 13
   ≤20 17
   >20 to ≤25 34
   >25 to ≤30 26
   >30 10
Menopausal status (440)
   Premenopausal 25
   Perimenopausal 7
   Postmenopausal 68
Exposure to OC (439)
   Never 49
   Ever 51
Current use of HRT (440)
   No 71
   Yes 29
Body mass index (kg/m2; 440) 25.5 (4.1)
Alcohol consumption (440)
   Nothing last year (teetotaller) 11
   Something last year (not last month) 11
   Something last month 78
Smoking (440)
   Never 40
   Current 30
   Ex 30
  1. Values are expressed as percentage or as mean (standard deviation). HRT, hormone replacement therapy; OC, oral contraceptives.