Receiver-operating characteristic curves of medical research council scale for pharyngeal dysfunction (valleculae and pyriform sinus residue scale or penetration aspiration scale >1) and occurrence of aspiration in 3-month follow-up. (A) Valleculae and pyriform sinus residue scale grade more than 1 (area under the curve = 0.77; 95% CI, 0.63–0.97; P = 0.012). (B) Penetration aspiration scale more than 1 (area under the curve = 0.80; 95% CI, 0.56–1; P = 0.02). (C) Development of aspiration (area under the curve = 0.74; 95% CI, 0.56–0.93; P = 0.02).