NPPB and nutritional deficiency disease: Our main analysis using the GNRI [k = 2; n = 148 with malnutrition (score >98) and n = 947 without malnutrition (score ≤98)] showed that malnutrition was associated with significantly higher levels of NT‐proBNP [MD: 1885.14, 95% CI (1428.76–2341.52, I2 = 0%, P < 0.01) (Figure4; divided by 100 as RevMan could not show values above 1000)].