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Infants in Each Zone at Worst Examination by Erythropoietin Therapy Status
| I | II | III | IV | Total | |
|---|---|---|---|---|---|
| EPO | 9 (10) | 55 (62) | 8 (9) | 17 (19) | 89 |
| No EPO | 38 (16) | 135 (58) | 15 (6) | 46 (20) | 234 |
Data are expressed as frequencies (percentages) in each zone. Unadjusted, P = 0.3735.
