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| Type | Lower esophageal sphincter | Esophageal body |
| I | Incomplete relaxation | Aperistalsis and absence of esophageal pressurization |
| II | Incomplete relaxation | Aperistalsis and panesophageal pressurization in at least 20% of swallows |
| III | Incomplete relaxation | Premature (spastic) contractions with distal contractility integral (DCI) >450 mmHg·s·cm with ≥20% of swallows |
