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Table 7 Differences between patients according to duration of use

From: The impacts of substance abuse and dependence on neuropsychological functions in a sample of patients from Saudi Arabia

  Duration of substance use   
Tests used 1-5 Years
mean ± SD
6-10 Years
mean ± SD
11-15 Years
mean ± SD
>15 Years
mean ± SD
F value P value
CTMT Time 1 b 70.68 ± 32.55 71.92 ± 25.81 75.60 ± 19.73 85.39 ± 22.61 F(3,101) = 2.74 0.05
CTMT Color errors 1 b 1.11 ± 1.41 0.45 ± 0.96 0.31 ± 0.86 0.84 ± 1.19 F(4,45) = 3.75 0.01
CTMT Time 2 b 115.63 ± 34.03 119.04 ± 29.24 122.49 ± 31.82 133.15 ± 40.95 F(3,80) = 2.83 0.04
Stroop time 4 b 25.38 ± 6.36 26.06 ± 6.61 28.87 ± 8.66 29.31 ± 8.28 F(3,101) = 2.68 0.05
Stroop Errors 4 b 2.76 ± 2.37 2.50 ± 2.00 3.29 ± 1.78 3.73 ± 2.46 F(3,50) = 2.80 0.05
Stroop Time 5 b 29.04 ± 7.77 29.71 ± 7.88 31.93 ± 10.15 34.35 ± 10.41 F(7,80) = 2.87 0.01
5 dots total score a 29.51 ± 7.98 28.45 ± 7.89 26.47 ± 2.94 24.64 ± 7.96 F(7,100) = 2.81 0.01
5 dots unique designs a 26.16 ± 7.99 25.28 ± 7.81 22.57 ± 8.76 21.93 ± 6.94 F(3,101) = 2.70 0.05
SDMT a 28.95 ± 11.16 31.85 ± 9.65 30.88 ± 10.58 25.49 ± 10.55 F(4,35) = 3.01 0.032
Benton Rotation errors b 0.32 ± 0.53 0.63 ± 0.87 1.22 ± 1.41 0.87 ± 1.24 F(2,81) = 4.452 0.01
  1. a. Higher scores indicate better function.
  2. b. higher scores indicate poorer function
  3. CTMT: color trail making test
  4. SDMT: symbol digit modality test