Although endoglin concentrations were marginally higher among individuals recruited from clinic (β = 0.67, P = 0.003, Table 3) than in individuals recruited from the catheterization lab, the association between endoglin concentration and class of renal function was qualitatively similar in both groups, and it was not significantly associated with CKD class, P = 0.45 and P = 0.43, respectively (Table 4). The gene discussed is ENG; the disease is chronic kidney disease.