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Table 3 The values of performance indicator of Contrast C test (Ŋ- contrast C) and percentage of contrast 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

Time Before intervention (Median ± IQR) After intervention (Median ± IQR) p-value*
Parameters
9:00 N = 16 Ŋ 0.2 ± 0.12 0.41 ± 0.12 < 0.001
Percentage of Contrast (%) 0.75 ± 0.26 0.52 ± 0.25 < 0.001
15:00 N = 16 Ŋ 0.14 ± 0.08 0.31 ± 0.09 < 0.001
Percentage of Contrast (%) 1.51 ± 0.9 1.39 ± 0.88 < 0.001
21:00 N = 16 Ŋ 0.22 ± 0.08 0.53 ± 0.08 < 0.001
Percentage of Contrast (%) 0.55 ± 0.32 0.43 ± 0.31 < 0.001
3:00 N = 16 Ŋ 0.11 ± 0.06 0.31 ± 0.07 < 0.001
Percentage of Contrast (%) 1.13 ± 0.64 1.04 ± 0.64 < 0.001
  1. *Wilcoxon Signed Ranks test