| Variable | Maximum sensory block | M. Bromage Score | Anaesthesia to S2 (minutes) | Surgery (minutes) | t (P-value) |
| Mean ± SD | Mean ± SD | ||||
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| T4-T6 | 3 | 365.9 ± 69.2 | 321.7 ± 14.3 | 1.665 (0.108) |
| Time to top up epidural/ NRS ≥ 3 cm | 179 ± 20.1 minutes |
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