We therefore used multivariate logistic regression to adjust for the role of age, while controlling for gender and WIMD, based on consistent identification of their contribution to outcomes in COVID-19 cohorts.21 25 Restricting to cases with complete data (n=130) across core and extended laboratory tests, we found an optimal combination of core test variables to be CRP, albumin, urea, neutrophil:lymphocyte ratio, creatinine, age, gender and WIMD (figure 3, online supplemental file S7). Here, ALB is linked to COVID-19.