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Table 4 Comparison of the values of visual performance indicators before and after the intervention

From: The effect of increasing the illumination on operators’ visual performance in the control-room of a combined cycle power plant

Before Intervention 9:00 15:00 p-value 21:00 3:00 p-value
Ŋ-acuity C N = 16 0.33 ± 0.09 0.22 ± 0.12 < 0.001* 0.33 ± 0.12 0.25 ± 0.13 < 0.001*
Visual acuracy (\( \frac{1}{Arcmin} \)) N = 16 1.62 ± 0.34 1.31 ± 0.56 < 0.001* 1.20 ± 0.41 1.02 ± 0.24 < 0.001*
Ŋ-contrast C N = 16 0.2 ± 0.12 0.14 ± 0.08 < 0.001* 0.22 ± 0.08 0.11 ± 0.06 < 0.001*
Percentage of Contrast (%) N = 16 0.75 ± 0.86 1.51 ± 0.9 < 0.001* 0.55 ± 0.32 1.13 ± 0.64 < 0.001*
After Intervention 9:00 15:00 p-value 21:00 3:00 p-value
Ŋ-acuity C N = 16 0.5 ± 0.12 0.32 ± 0.11 < 0.001* 0.59 ± 0.1 0.34 ± 0.13 < 0.001*
Visual acuracy (\( \frac{1}{Arcmin} \)) N = 16 1.84 ± 0.38 1.52 ± 0.66 < 0.001* 1.51 ± 0.31 1.23 ± 0.23 < 0.001*
Ŋ-contrast C N = 16 0.41 ± 0.12 0.31 ± 0.09 < 0.001* 0.53 ± 0.08 0.31 ± 0.07 < 0.001*
Percentage of Contrast (%) N = 16 0.52 ± 0.85 1.39 ± 0.88 < 0.001* 0.43 ± 0.31 1.04 ± 0.64 < 0.001*
  1. *Wilcoxon Signed Ranks test