RTEL1 and COVID-19: In Table 2, the hematologic indices such as SIRI, RDW, NLR, and NHL displayed a significantly higher predictive value (AUC ≥ 0.60) for severe COVID-19 (PaO2/FiO2 ≤ 100), while for IMV, eight indices, including RDW, NLR, MLR, dNLR, AISI, SII, SIRI, and NHL show predictive value (AUC ≥ 0.60).