Table 3 Agreement between the first and second measures using the BI-RADS classification
From: Evaluation of mammographic density patterns: reproducibility and concordance among scales
Number of mammograms classified in each category in the first and second measurements | |||||
|---|---|---|---|---|---|
Second measure | |||||
First measure | Almost entirely fat | Scattered fibroglandular densities | Heterogeneously dense | Extremely dense | Total |
Almost entirely fat | 147 | 13 | 0 | 0 | 160 |
Scattered fibroglandular densities | 14 | 101 | 10 | 0 | 125 |
Heterogeneously dense | 0 | 14 | 48 | 6 | 68 |
Extremely dense | 0 | 0 | 3 | 19 | 22 |
Total | 161 | 128 | 61 | 25 | 375 |
Kappa-statistic estimation | |||||
Agreement | Kappa (95% CI) | Weighted Kappa (95% CI) | Kappa high/low risk (95% CI) | ||
Observed % | Expected % | ||||
84.00 | 33.04 | 0.761 (0.706-0.814) | 0.904 (0.877-0.928) | 0.815 (0.746-0.885) | |