| Analgesia Protocol | Overall | Remifentanil | Sufentanil | No opioid |
| Number of subjects | 40 | 32 | 5 | 3 |
| PDR elicitable | 100% | 100% | 100% | 100% |
| PDR stimulation intensity (mean ± SD, mA) | 49.75 ± 12.91 | 49.69 ± 2.31 | 54.00 ± 6.00 | 43.33 ± 6.67 |
| PDR PPI score (mean ± SD) | 4.55 ± 0.39 | 5.09 ± 0.50 | 4.00 ± 1.73 | 6.33 ± 0.88 |
| NFR elicitable | 72% | 69% | 60% | 0% |
| NFR measurement error (no reflex assessed) | 15% | 19% | 20% | - |
| NFR threshold (mean ± SD) | 44.93 ± 4.93 | 39.93 ± 4.65 | 48.22 ± 16.84 | 53.33 ± 8.37 |
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