Table 1 Demographics of women enrolled in MyMammoStudy
Demographics | Range/Number of women | Mean/Percentage (%) |
|---|---|---|
Age at enrolment (years) | 40–74 | 50.75 (7.31) |
Body-mass index (kg/m2) | 14–47 | 24.96 (4.49) |
Ethnicity | ||
 Chinese | 1163 | 65.4 |
 Indian | 293 | 16.5 |
 Malay | 244 | 13.7 |
 Others | 78 | 4.4 |
Education level | ||
 Primary or less | 123 | 6.9 |
 Secondary | 883 | 49.7 |
 Tertiary | 771 | 43.4 |
 Missing data | 1 | 0.1 |
Average monthly income (RM) | ||
 ≤ 5,000 [≤ USD 1,200] | 817 | 46.0 |
 5,000–10,000 [USD 1,200–2,300] | 544 | 30.6 |
 ≥ 10,000 [≥ USD 2,300] | 359 | 20.2 |
 Missing data | 58 | 3.3 |
Hormonal | ||
Age at menarche (years) | ||
 < 12 | 220 | 12.4 |
 12–13 | 1031 | 58.0 |
 ≥ 14 | 514 | 28.9 |
 Unknown or data missing | 13 | 0.7 |
Menopausal status | ||
 Pre-/Peri-menopausal | 920 | 51.7 |
 Post-menopausal | 857 | 48.2 |
 Never had menses | 1 | 0.1 |
Number of pregnancies | ||
 0 | 237 | 13.3 |
 1–2 | 534 | 30.0 |
 3–4 | 737 | 41.5 |
 ≥ 5 | 268 | 15.1 |
 Unknown or data missing | 2 | 0.1 |
Age at first birth (years) | ||
 < 20 | 63 | 3.5 |
 20–24 | 340 | 19.1 |
 25–29 | 678 | 38.1 |
 ≥ 30 | 452 | 25.4 |
 Nulliparous | 237 | 13.3 |
 Unknown or missing data | 8 | 0.4 |
 Family history of breast cancer (1° relative) | 260 | 14.6 |