CRP and COVID-19: However, in linear regression models, adjusted for age, sex, race, ICU stay and primary diagnosis (COVID-19 or MIS-C), the square root CRP was significantly increased (β = 1.79: 95% CI: 0.22–3.36) and the albumin level was 0.22 mg/dl lower (β = −0.22: 95% CI: −0.42–−0.01), as compared to those with eunatremia (Table 4, Supplementary Table S3).