ALB and myalgic encephalomeyelitis/chronic fatigue syndrome: Univariate Cox regression analysis showed that older age, the need for support with ADL and mobility assistance, multiple hospital admissions <6 months before surgery, chronic renal insufficiency (GFR < 45 mL/min), G8 < 8, CFS ≥ 5, ASA > 3, MNA‐SF < 8, haemoglobin < 120 g/L and albumin level < 31 g/L were associated with poor OS.