Classification Schema for EGR
| Class | Description | Incidence | Subclassification of persistent or transient |
| A | EGR on presincalide imaging with either no EGR on postsincalide imaging or EGR on postsincalide imaging of the same or less intensity than presincalide EGR. | 6 of 34 patients | 5 of 6 persistent |
| 1 of 6 transient | |||
| B | EGR on postsincalide imaging only. | 21 of 34 patients | 20 of 21 persistent |
| 1 of 21 transient | |||
| C | EGR on both presincalide and postsincalide imaging with increase in EGR intensity during the postsincalide period. | 7 of 34 patients | 3 of 7 persistent |
| 4 of 7 transient |