Table 1.
Characteristics of the study population at the last questionnaire available before the date of diagnosis of cases (N = 388)
| All (N = 388) | Breast cancer | Global p-value* | ||
|---|---|---|---|---|
| Control (N = 194) | Case (N = 194) | |||
| Time of follow-up (years) | 12.246 (1.947) | 12.257 (1.955) | 12.238 (1.944) | 0.060 |
| Education | 0.580 | |||
| ≤ BAC | 39 (10.052) | 22 (11.340) | 17 (8.762) | |
| BAC to BAC + 2 | 191 (49.226) | 97 (50.000) | 94 (48.454) | |
| > BAC + 2 | 158 (40.722) | 75 (38.660) | 83 (42.784) | |
| Physical activity (metabolic equivalent tasks (MET)-hour/week) | 44.513 (36.840) | 46.134 (37.878) | 42.892 (35.797) | 0.388 |
| Smoking status | 0.184 | |||
| Never | 187 (48.196) | 87 (44.845) | 100 (51.546) | |
| Ever | 201 (51.804) | 107 (55.155) | 94 (48.454) | |
| Body masse index at blood draw (kg/m2) | 23.815 (3.553) | 23.850 (3.614) | 23.779 (3.500) | 0.763 |
| Family history of breast cancer | 0.283 | |||
| None | 278 (71.650) | 144 (74.227) | 134 (69.072) | |
| In first-degree relatives | 59 (15.206) | 30 (15.464) | 29 (14.949) | |
| In extended relatives | 51 (13.144) | 20 (10.309) | 31 (15.979) | |
| Personal history of benign breast disease | 0.111 | |||
| No | 224 (57.732) | 120 (61.856) | 104 (53.608) | |
| Yes | 164 (42.268) | 74 (38.144) | 90 (46.392) | |
| Age at menarche (year) | 12.807 (1.378) | 12.745 (1.446) | 12.869 (1.306) | 0.370 |
| Age at menopause | 0.437 | |||
| Menopause before age 51 | 189 (48.711) | 98 (50.515) | 91 (46.907) | |
| Menopause at age 51 or later | 199 (51.289) | 96 (49.485) | 103 (53.093) | |
| Use of oral contraceptives | 0.420 | |||
| Never | 133 (34.278) | 70 (36.082) | 63 (32.474) | |
| Ever | 255 (65.722) | 124 (63.918) | 131 (67.526) | |
| Current use of menopausal hormone therapy | 0.235 | |||
| No | 301 (77.577) | 155 (79.897) | 146 (75.258) | |
| Yes | 87 (22.423) | 39 (20.103) | 48 (24.742) | |
| Parity and age at first full-term pregnancy (FFTP) | 0.171 | |||
| No children | 55 (14.174) | 22 (11.340) | 33 (17.010) | |
| 1 or 2 children and < 25 years old at FFTP | 192 (49.485) | 95 (48.969) | 97 (50.000) | |
| ≥ 3 children and < 25 years old at FFTP | 106 (27.320) | 61 (31.443) | 45 (23.196) | |
| ≥ 25 years old at FFTP | 35 (9.021) | 16 (8.248) | 19 (9.794) | |
| Total breastfeeding duration in months | 0.343 | |||
| Never | 150 (38.659) | 79 (40.722) | 71 (36.598) | |
| ≤ 6 | 162 (41.753) | 83 (42.784) | 79 (40.722) | |
| > 6 | 76 (19.588) | 32 (16.494) | 44 (22.680) | |
| Adherence score to Prudent dietary pattern | 0.053 | |||
| < median | 193 (49.742) | 87 (44.845) | 106 (54.639) | |
| ≥ median | 195 (50.258) | 107 (55.155) | 88 (45.361) | |
| Adherence score to Western dietary pattern | 0.915 | |||
| < median | 193 (49.742) | 96 (49.485) | 97 (50.000) | |
| ≥ median | 195 (50.258) | 98 (50.515) | 97 (50.000) | |
Mean (Standart deviation) and Counts (Percentages) are presented for continuous and categorical variables respectively