Variables | Cases X | Cases n. | Cases % | Contr. X | Contr. n. | Contr. % | P value |
---|---|---|---|---|---|---|---|
Age | 57.00 | Â | Â | 50.03 | Â | Â | 9.0E-07a |
Height | 159.24 | Â | Â | 160.50 | Â | Â | 0.1 |
Weight | 64.50 | Â | Â | 60.20 | Â | Â | 0.002a |
BMI | 25.40 | Â | Â | 23.40 | Â | Â | Â |
  < 25 |  | 72 | 53.33 |  | 80 | 71.43 | 0.004 |
 25–30 |  | 38 | 28.15 |  | 25 | 22.32 |  |
  ≥ 30 |  | 25 | 18.52 |  | 7 | 6.25 |  |
Age at menarche | 12.44 | Â | Â | 12.72 | Â | Â | 0.1 |
 7–10 |  | 12 | 8.89 |  | 8 | 7.14 | 0.7 |
 11–13 |  | 90 | 66.67 |  | 72 | 64.28 |  |
 14–17 |  | 33 | 24.44 |  | 32 | 28.58 |  |
Menopause | |||||||
 natural menopause |  | 62 | 45.93 |  | 55 | 49.11 | 0.6 |
 age | 49.90 |  |  | 48.60 |  |  | 0.1 |
 HRT regimen |  | 11 | 17.74 |  | 8 | 14.54 | 0.6 |
Parity | Â | 97 | 71.85 | Â | 71 | 63.39 | 0.2 |
 first full-term pregnancy | 27.59 |  |  | 29.56 |  |  | 0.1 |
 number of live birth | 2.05 |  |  | 1.82 |  |  | 0.1 |
Breastfed | Â | 78 | 80.41 | Â | 63 | 88.73 | 0.2 |
 months of breastfeeding | 11.83 |  |  | 12.72 |  |  | 0.9 |
Oral contraceptive use | Â | 78 | 57.77 | Â | 87 | 77.67 | 0.001a |
 duration of employment: | |||||||
   ≤ 5 y |  | 20 | 25.64 |  | 33 | 37.93 | 0.2 |
  6–14 y |  | 35 | 44.87 |  | 33 | 37.93 |  |
   ≥ 15 y |  | 23 | 29.49 |  | 21 | 24.14 |  |
Benign breast lesions | Â | 29 | 21.48 | Â | 12 | 10.71 | 0.03 |
BC family | |||||||
 in first degree relatives | 1.34 |  |  | 0.74 |  |  | 8.8E-05a |
  0 cases |  | 47 | 34.81 |  | 62 | 55.36 | 4.0E-04a |
  1–2 cases |  | 58 | 42.96 |  | 42 | 37.50 |  |
   ≥ 3 |  | 30 | 22.22 |  | 8 | 7.14 |  |
Tumor family | |||||||
 in first degree relatives: | 3.42 |  |  | 2.81 |  |  | 0.03 |
  0–2 cases |  | 51 | 37.78 |  | 57 | 50.90 | 0.05 |
  3–5 |  | 57 | 42.22 |  | 43 | 38.39 |  |
   ≥ 6 |  | 27 | 20.00 |  | 12 | 10.71 |  |
Alcohol intake | |||||||
 daily-often |  | 31 | 22.96 |  | 13 | 11.61 | 0.03 |
 occasionally- nondrinkers |  | 104 | 77.04 |  | 99 | 88.39 |  |
Smoking status (smokers at recruitment) | Â | 19 | 14.07 | Â | 18 | 16.07 | 0.7 |
Smokers (at recruitment+ex smokers) | Â | 68 | 50.37 | Â | 56 | 50.00 | 0.2 |
 cigarette packs/year: |  |  |  |  |  |  |  |
   < 10 |  | 30 | 44.12 |  | 25 | 44.64 | 0.3 |
  10–19 |  | 16 | 23.53 |  | 19 | 33.93 |  |
   ≥ 20 |  | 22 | 32.35 |  | 12 | 21.43 |  |
 passive smoke: |  | 100 | 74.07 |  | 87 | 77.68 | 5.0E-04a |
  little |  | 22 | 22.00 |  | 41 | 47.13 |  |
  moderately |  | 46 | 46.00 |  | 27 | 31.03 |  |
  strong |  | 32 | 32.00 |  | 19 | 21.84 |  |
Osteoporosis | Â | 41 | 30.37 | Â | 22 | 19.64 | 0.06 |
Chemical exposure | Â | 43 | 31.85 | Â | 18 | 16.07 | 0.04 |
Sport activity (2–3 times a week) |  | 45 | 33.33 |  | 43 | 38.39 | 0.4 |
Adolescence sport activity | Â | 36 | 26.66 | Â | 56 | 50.00 | 2.0E-04a |