4K ® score Time frame Time frame Total P-value
April-July 2019 – Control group April-July 2020 – study group
≤7.5% - low-risk 279 (39%) 164 (36.4%) 443 (37.8%) P>0.1
>7.5% -moderate-risk 442 (61%) 286 (63.6%) 728 (62.2%)
≤ 20% - moderate-risk 526 (73%) 304 (67.6%) 830 (70.9%) P<0.05
>20% - high-risk 195 (27%) 146 (32.4%) 341 (29.1%)
≤33% 628 (87.1%) 370 (82.2%) 998 (85.2%) P<0.05
>33% 93 (12.9%) 80 (17.8%) 173 (14.8%)