Table 4.
K statistics. The agreement on the breast density category of dense/non-dense between radiologists (Rad1, Rad2, and Rad3) and the Quantra software (QDC). CI: 95% confidence interval. CON: consensus of the three radiologists. A p-value < 0.05 was considered statistically significant.
| Observers | OVERALL | 40–49 | 50–69 | >70 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| K | CI | p | K | CI | p | K | CI | p | K | CI | p | |
| Rad1/Rad2 | 0.87 | (0.81–0.93) | <0.05 | 0.76 | (0.56–0.96) | <0.05 | 0.88 | (0.82–0.94) | <0.05 | 0.79 | (0.54–1.04) | 0.65 |
| Rad1/Rad3 | 0.81 | (0.75–0.87) | <0.05 | 0.70 | (0.50–0.90) | <0.05 | 0.81 | (0.75–0.88) | <0.05 | 0.81 | (0.56–1.06) | <0.5 |
| Rad2/Rad3 | 0.88 | (0.82–0.94) | <0.05 | 0.81 | (0.60–1.02) | <0.5 | 0.88 | (0.82–0.94) | <0.05 | 0.84 | (0.60–1.09) | <0.05 |
| Rad1/QDC | 0.76 | (0.70–0.82) | <0.05 | 0.61 | (0.42–0.80) | <0.05 | 0.77 | (0.71–0.84) | <0.05 | 0.62 | (0.37–0.87) | <0.5 |
| Rad2/QDC | 0.82 | (0.76–0.88) | <0.05 | 0.84 | (0.63–1.04) | <0.05 | 0.82 | (0.76–0.88) | <0.05 | 0.65 | (0.41–0.90) | <0.5 |
| Rad3/QDC | 0.86 | (0.80–0.92) | <0.05 | 0.83 | (0.62–1.04) | <0.5 | 0.86 | (0.80–0.93) | <0.05 | 0.74 | (0.49–0.99) | 0.7 |
| CON/QDC | 0.83 | (0.77–0.89) | <0.05 | 0.78 | (0.57–0.98) | <0.05 | 0.83 | (0.77–0.89) | <0.05 | 0.74 | (0.49–0.99) | <0.5 |