NPPB and metabolic syndrome: Age, sex, BMI, Alb, BNP, CRP, eGFR, GNRI, heart rate, pre-hospitalization Katz index, diabetes, dyslipidemia, cerebrovascular disease, care levels of Japanese public long-term care insurance, nursing home resident, employment status, length of hospital stay, outcomes, grip strength, and SPPB were significantly different among the three groups.