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

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

Time		Before intervention (Median ± IQR)	After intervention (Median ± IQR)	p-value^*
Parameters		Before intervention (Median ± IQR)	After intervention (Median ± IQR)	p-value^*
9:00 N = 16	Ŋ	0.2 ± 0.12	0.41 ± 0.12	< 0.001
9:00 N = 16	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
15:00 N = 16	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
21:00 N = 16	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
3:00 N = 16	Percentage of Contrast (%)	1.13 ± 0.64	1.04 ± 0.64	< 0.001

ISSN: 2052-4374