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| Methods | Prospective, randomized study |
| Participants | A total of 90 adult patients who underwent elective surgical operations under spinal anaesthesia were evaluated |
| Interventions | Patients were randomly allocated to 3 groups of 30 each to receive spinal anaesthesia using 20‐ G, 22 G or 24‐gague spinal needles |
| Outcomes | The primary outcome was: incidence of headache and frequency of hearing loss |
| Notes | — |
