Table 3

Contrast sensitivity (log unit) at all spatial frequencies under moderate and dim light conditions

Illumination level	SF (cycles per degree)	Case		Control
Illumination level	SF (cycles per degree)	Mean±SD	Median (range)	Mean±SD	Median (range)	p*	Adjusted p†
Moderate	3	1.62±0.2	1.63 (1.17 to 2.08)	1.69±0.22	1.78 (0.7 to 2.08)	0.081	0.112
	6	1.81±0.2	1.84 (1.21 to 2.29)	1.97±0.17	1.99 (1.38 to 2.29)	<0.001	<0.001
	12	1.46±0.25	1.54 (0.61 to 1.99)	1.59±0.25	1.69 (0.61 to 1.99)	0.003	0.042
	18	1.02±0.32	0.96 (0.17 to 1.55)	1.22±0.25	1.25 (0.64 to 1.55)	<0.001	0.002
Dim
	3	1.53±0.2	1.49 (1.17 to 2.08)	1.68±0.19	1.63 (1 to 2.08)	<0.001	0.001
	6	1.8±0.22	1.84 (1.38 to 2.29)	1.93±0.25	1.99 (0.91 to 2.29)	0.002	0.034
	12	1.38±0.3	1.4 (0.61 to 1.99)	1.6±0.25	1.54 (0.91 to 1.99)	<0.001	<0.001
	18	0.96±0.33	0.96 (0.17 to 1.55)	1.18±0.3	1.25 (0.17 to 1.55)	<0.001	0.006

*Based on GEE analysis.
†Adjusted for age and sex, based on GEE analysis.
GEE, generalized estimating equation; SD, standard deviation; SF, spatial frequency.