Table 1. Operational definitions of bolus flow durations and timing measures collected at each video fluoroscopic swallowing assessment.

Duration	Definition
Oral transit duration (OTD)	Time from beginning of posterior bolus movement until arrival of bolus head at ramus of mandible
Oral clearance duration (OCD)	Time from beginning of posterior bolus movement until arrival of bolus tail at ramus of mandible
Duration of laryngeal vestibule closure (LVC)	Time from first contact between arytenoids and base of epiglottis until last contact
Stage transition duration (STD)	Time between first maximum hyoid elevation and bolus head enters pharynx
Pharyngeal transit duration (PTD)	Time from arrival of bolus head at ramus of mandible until bolus head entering UES
Pharyngeal clearance duration (PCD)	Time from arrival of bolus head at ramus of mandible until bolus tail entering UES
Pharyngeal response duration (PRD)	Time from beginning of hyoid excursion until hyoid returns to rest
Duration of hyoid maximum elevation (DOHME)	Time from first maximum hyoid elevation until last maximum hyoid elevation (duration hyoid remains maximally elevated before depressing)
Duration of hyoid maximum anterior excursion (DOHMAE)	Time from first maximum hyoid anterior excursion until last maximum hyoid anterior excursion (duration hyoid remains maximally elevated in anterior excursion position before depressing)
Duration to UES opening (DTCPO)	Time from beginning of posterior bolus movement in oral cavity until UES opening
Duration of UES opening (DOCPO)	Time from UES opening until UES closed
Beginning of LVC and when bolus head enters pharynx (BLVC-HEP)	Time between beginning of LVC and when bolus head enters pharynx
Beginning of LVC and beginning of maximum hyoid elevation (BLVC-MHE)	Time between beginning of LVC and first maximal hyoid elevation
Total swallowing duration (TSD)	Time from beginning of posterior bolus movement in oral cavity until hyoid returns to rest

Note : UES = upper esophageal sphincter.