Table 3. Classification of the mammographies as BI-RADS® 1 and 2 and BI-RADS® 4 and 5, separated by year.
| Period | 2019 | 2020 | p value |
|---|---|---|---|
| First period | |||
| BI-RADS® 1 and 2 | 4,797 (97.3) | 693 (93.8) | |
| BI-RADS® 4 and 5 | 131 (2.7) | 46 (6.2) | |
| Total | 4,928 (100) | 739 (100) | <0.001 |
| Second period | |||
| BI-RADS® 1 and 2 | 8,181 (96.8) | 8,239 (96.1) | |
| BI-RADS® 4 and 5 | 272 (3.2) | 336 (3.9) | |
| Total | 8,453 (100) | 8,575 (100) | 0.014 |
Results expressed as n (%).
In 2020, in both periods, we observed an increase in the proportion of exams classified as BI-RADS® 4 and 5 in relation to BI-RADS® 1 and 2 when comparing to 2019. χ2 test, p<0.001 (first period)/p=0.014 (second period).