Table 3 Univariate analysis of variables associated with adjunct ultrasonography recommendation
Demographics | Adjuvant ultrasonography recommendation | ||
|---|---|---|---|
No. of women (%) | p-value | ||
Recommended (n = 546) | Not recommended (n = 1,232) | ||
Age at enrolment (years) | |||
 < 50 | 301 (55.1%) | 545 (44.2%) | 0.000* |
 ≥ 50 | 245 (44.9%) | 687 (55.8%) | |
 Mean age (SD) | 49.93 (7.2) | 51.12 (7.3) | 0.002* |
 Body-mass index (kg/m2), mean (SD) | 24.72 (4.8) | 25.07 (4.3) | 0.129 |
Ethinicity | |||
 Chinese | 360 (65.9%) | 803 (65.2%) | 0.719 |
 Indian | 95 (17.4%) | 198 (16.1%) | |
 Malay | 69 (12.6%) | 175 (14.2%) | |
 Others | 22 (4.0%) | 56 (4.5%) | |
Hormonal | |||
Age at menarche (years) | |||
 < 12 | 76 (14.0%) | 144 (11.8%) | 0.082 |
 12–13 | 295 (54.5%) | 736 (60.1%) | |
 ≥ 14 | 170 (31.4%) | 344 (28.1%) | |
Menopausal status | |||
 Pre-/Peri-menopausal | 320 (58.6%) | 600 (48.7%) | 0.001* |
 Post-menopausal | 226 (41.4%) | 631 (51.3%) | |
Number of pregnancies | |||
 0 | 78 (14.3%) | 159 (12.9%) | 0.094 |
 1–2 | 180 (33.0%) | 354 (28.8%) | |
 3–4 | 203 (37.2%) | 534 (43.3%) | |
 ≥ 5 | 85 (15.6%) | 183 (14.9%) | |
Age at first birth (years) | |||
 < 20 | 23 (4.9%) | 40 (3.7%) | 0.021* |
 20–24 | 89 (19.1%) | 251 (23.5%) | |
 25–29 | 195 (41.8%) | 483 (45.3%) | |
 ≥ 30 | 159 (34.1%) | 293 (27.5%) | |
Parity | |||
 Parous | 466 (85.3%) | 1,067 (86.6%) | 0.477 |
 Non-parous | 80 (14.7%) | 165 (13.4%) | |
 Average volume density, (%) | 14.02 (8.38) | 12.69 (8.41) | 0.036* |
Radiologists | |||
 Radiologist reporting < 180 mammograms | 242 (44.3%) | 176 (14.3%) | 0.000* |
 Radiologist reporting > 360 mammograms | 304 (55.7%) | 1,056 (85.7%) | |