GSTM1 and inflammatory bowel disease: The multivariate logistic regression showed lower BMI (B = –0.242, P = .007), lower Hb (B = –0.029, P = .011), higher ESR (B = 0.062, P = .020), more smoking history (B = 1.507, P = .010), and more gastrointestinal surgery history (B = 1.315, P = .017) were risk factors for IBD patients developing low muscle mass (Table 2).