Light characteristics of the operating microscopes
| Variables | Experimental group (n=63) | Control group (n=65) | P value |
| Light intensity* (Lux) | |||
| Median (Q1–Q3) | 3425.0 (2296.0–4300.0) | 24 279.0 (16 000.0–26 500.0) | <0.0001† |
| Luminosity* (%) | |||
| Median (Q1–Q3) | 21.0 (17.0–25.0) | 50.0 (50.0–55.0) | <0.0001† |
| Maximal luminosity‡ (%) | |||
| Median (Q1–Q3) | 25.0 (17.0–25.0) | 50.0 (50.0–55.0) | <0.0001† |
*Light intensity and luminosity were measured at the beginning of surgery.
†P values are based on the Wilcoxon-Mann-Whitney test.
‡Maximal luminosity was measured during surgery.