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Table 3 Changes in Contrast Sensitivity (Log CS) at Different Levels of Illumination Ω

From: Lutein supplementation in retinitis pigmentosa: PC-based vision assessment in a randomized double-masked placebo-controlled clinical trial [NCT00029289]

Level of Illumination Normal (100%) Low (4%) Very Low (0.1%)
Covariates§ Coefficient¶ (95% CI) P value Coefficient (95% CI) P value Coefficient (95% CI) P value
Treatment 0.0154 (-0.0164,0.0471) 0.342 0.0408 (-0.0273,0.1089) 0.241 -0.0184 (-0.0545, 0.0176) 0.316
Period 0.0351 (0.0025,0.0677) 0.035 0.0014 (-0.0853,0.0880) 0.975 - -
Time (number of weeks) 0.0008 (-0.0008, 0.0025) 0.313 0.0001 (-0.0034, 0.0037) 0.934 -0.0009 (-0.0024,0.0006) 0.237
Age - - -0.0049 (-0.0061,-0.0038) <0.001 - -
Vitamin A Use - - - - - -
Iris color - - - - - -
Period × Treatment - - - - - -
Treatment × Time - - - - - -
Period × Time - - -0.0028 (-0.0055,-0.0001) 0.042 - -
Baseline Log CS 0.9865 (0.9289, 1.0440) <0.001 0.9451 (0.8496, 1.0406) <0.001 0.9721 (0.9003,1.0440) <0.001
Intercept 0.0133 (-0.0705, 0.0971) 0.755 0.2781 (0.1374,0.4188) <0.001 0.459 (-0.0119, 0.1037) 0.119
  1. Ω Variables and model criteria: See Table 2.
  2. ¶ The coefficient indicates the change in Log CS units per unit change in the covariate.