Table 6.
Details of mammographic shape and margin, its positive predictive values, and P value
| Mammographic morphological features | BI-RADS category | ||||
|---|---|---|---|---|---|
| BI-RADS 4a (PPV) | BI-RADS 4b (PPV) | BI-RADS 4c (PPV) | BI-RADS 4 (PPV) | P value | |
| Mass shape | |||||
| • Round | 0 (0) | 0 (0) | 0 (0) | 0 (0) | - |
| • Oval | 34 (29.3) | 22 (91) | 0 (0) | 56 (53.6) | 0.0032# |
| • Irregular | 38 (36.8) | 88 (86.4) | 64 (96.9) | 190 (80.0) | 0.0096 |
| Mass margin | |||||
| • Well-circumscribed | 8 (50) | 2 (0) | 0 (0) | 10 (40.0) | 0.009## |
| • Microlobulated | 8 (25) | 24 (91.7) | 28 (100) | 60 (86.7) | 0.015 |
| • Masked | 24 (33.3) | 28 (85.7) | 14 (85.7) | 66 (66.7) | 0.075 |
| • Indistinct | 32 (31.2) | 46 (91.3) | 16 (100) | 94 (72.3) | 0.312 |
| • Spiculated | 0 (0) | 10 (100) | 6 (100) | 16 (100) | 0.209 |
Calculated by chi-square analysis on 2 × 2 table, n = 246
#,##oval shape and well-circumscribed margin showed P value less than 0.05, but on phi coefficient calculation, it showed value of −0.2654 and −0.165, respectively, s/o inverse associations