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Forest plots displaying the associated burden of having iron deficiency (ID) in a head‐to‐head comparison to syndromes without ID on (A) 6‐min walk test, and (B) Kansas City Cardiomyopathy Questionnaire (KCCQ) overall summary score. CKD, chronic kidney disease; CRAIDS, cardio‐renal anaemia iron deficiency syndrome; CRAS, cardio‐renal anaemia syndrome; CRIDS, cardio‐renal iron deficiency syndrome; IDA, iron deficiency anaemia. *p < 0.05; **p < 0.01; ***p < 0.001.
