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Table 1 Baseline Values and Frequencies by Treatment Group

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

   Group I Group II
Variable*   (Wash-out Group) (N = 16) (Build-up Group) (N = 18)
Gender (Female to Male)   11/5 10/8
Age   52.4 ± 1.7 46.4 ± 2.3
Vitamin A Consumption   6 5
Iris color    
  Dark Brown/Light Brown 6 5
  Green/Hazel 6 6
  Dark Blue/Light Blue 4 7
Skin Color    
  Pale 2 3
  Pale 10 14
  Light Brown 0 0
  Dark Brown 3 2
Cystoid Macular Edema   5 7
Visual Acuity (Log MAR)    
  Normal Illumination 0.275 ± 0.062 0.280 ± 0.050
  4% Illumination 0.497 ± 0.065 0.591 ± 0.072
  0.1% Illumination 0.902 ± 0.062 0.891 ± 0.065
Contrast Sensitivity (Log CS)    
  Normal Illumination 1.471 ± 0.105 1.346 ± 0.114
  4% Illumination 1.184 ± 0.090 0.928 ± 0.118
  0.1% Illumination 0.708 ± 0.102 0.658 ± 0.091
Log Retinal Area (square mm)   0.778 ± 0.336 0.970 ± 0.340
  1. * Continuous variables are presented as mean ± standard error, while categorical and binomial variables are presented as absolute frequency.
  2. † Skin color was defined based on the phenotype of the participant. Pale+ refers to the very light skin color that burns rapidly in exposure to the sun.