Fig. 2: correlation of iron intake with serum iron. (A and B) Spearman’s rank correlation between iron intake by food frequency questionnaire (FFQ) and 3-day food record (3dFR), and serum iron (pooled CD4 cell count groups), ρ = -0.3448, p = 0.0132, and ρ = -0.2966, p = 0.0886, respectively. The data were expressed as the mean of the iron intake in milligrams per day (mg/day), and serum iron was expressed as μM.