Although low PMVI was significantly associated with delayed acquisition of independent walking in the crude model (OR, 1.02; 95% CI: 1.01–1.04), after adjustment for age, type of operation, GNRI, eGFR, BNP, delirium, duration requiring mechanical ventilator, and physical fitness [model 1: SPPB (OR, 1.00; 95% CI: 0.98–1.02), model 2: GS/BMI (OR, 1.00; 95% CI: 0.98–1.02), and model 3: 6MWD (OR, 1.00; 95% CI: 0.99–1.01)], there was no association between the two sides. The gene discussed is NPPB; the disease is delirium.