Operating room noise levels by category of surgery
| Division | Mean±SD, dB(A) | Range, dB(A) | Number of measurements | F | p Value |
| Thoracic | 63.2±1.3 | 61.6–65.1 | 11 | 3.381 | <0.001 |
| Otolaryngology* | 63.3±1.5 | 59.9–65.8 | 39 | ||
| General surgery* | 63.5±2.4 | 59.2–72.3 | 33 | ||
| Sports medicine | 64.1±1.5 | 61.4–66.3 | 10 | ||
| Urology | 64.2±2.0 | 61.8–68.1 | 20 | ||
| Neurosurgery | 64.2±1.8 | 59.8–66.7 | 16 | ||
| Gynaecology | 64.4±2.0 | 61.3–68.9 | 15 | ||
| Cardiology | 64.5±2.3 | 61.1–68.4 | 11 | ||
| Orthopaedic | 64.8±2.6 | 60.9–72.0s | 29 | ||
| Ophthalmology | 65.4±1.6 | 62.5–71.1 | 41 | ||
| Total | 64.2±2.1 | 59.2–72.3 | 225 |
*Lower noise levels than the Ophthalmology Department.