- Population characteristics.
| Characteristics | n (%) |
|---|---|
| Nationality | |
| Saudi | 280 (68.5) |
| Non-Saudi | 129 (31.5) |
| Age at screening | |
| ≤49 years | 17 (4.1) |
| 50-54 years | 190 (46.3) |
| 55-59 years | 114 (27.8) |
| ≥60 years | 89 (21.7) |
| Age at first pregnancy | |
| ≤21 years | 194 (51.6) |
| >21 years | 182 (48.4) |
| Age at menarche | |
| <12 years | 62 (15.8) |
| 12-14 years | 256 (65.3) |
| >14 years | 74 (18.9) |
| Age at menopause | |
| <45 years | 40 (14.3) |
| ≥45 years | 240 (85.7) |
| Number of children | |
| ≤4 | 175 (46.5) |
| 5-7 | 167 (44.4) |
| ≥8 | 34 (9.0) |
| Breastfeeding | |
| No | 52 (12.7) |
| Yes | 357 (87.3) |
| Hormonal replacement therapy | |
| No | 320 (79.0) |
| Yes | 85 (21.0) |
| Family history of BC | |
| No | 327 (80.5) |
| Yes | 79 (19.5) |
| Body mass index | |
| Underweight | 2 (0.6) |
| Normal weight | 43 (12.6) |
| Obese | 182 (53.5) |
| Overweight | 113 (33.2) |
| Parity | |
| No | 33 (8.1) |
| Yes | 376 (91.9) |
| Age (years), mean±SD | 55.71±5.72 |
| Age at first pregnancy (years), mean±SD | 21.8±4.94 |
| Age at menarche (years), mean±SD | 12.9±1.74 |
| Age at menopause (years), mean±SD | 49.07±5.04 |
| Body mass index (kg/m2), mean±SD | 31.11±12.04 |
Values are presented as numbers and percentages (%) or mean ± standard deviation (SD).
BC: breast cancer