| Data items | Value |
| Age |
|
| Mean (SD), year | 52.9 (22.4) |
| Sex, number (%) |
|
| Male | 16 (53) |
| Female | 14 (47) |
| Body mass index |
|
| Mean (SD), kg/m2 | 23.4 (4.9) |
| ASA classification, number (%) |
|
| 1 | 7 (23) |
| 2 | 14 (47) |
| 3 | 9 (30) |
| Anesthesia time |
|
| Mean (SD), minutes | 180.8 (88.4) |
| Operation time |
|
| Mean (SD), minutes | 126.0 (79.4) |
| Region tympanic membrane, number (%) |
|
| right | 16 (53) |
| left | 14 (47) |