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Table 1 Age and level of education of patient and control groups

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

  Number of patients according to years of education   Mean age
Group ≤ 6 years 7-9 years 10-12 years > 12 years Age range ± SD
Alcohol 7 16 22 5 19-54 30.22 ± 8.35
Heroin 7 15 23 5 21-51 32.51 ± 9.22
Amphetamine 8 14 28 4 18-49 33.34 ± 7.14
All patients 22 45 73 14 18-54 33.16 ± 8.3
Control 14 29 49 8 18-50 31.24 ± 9.4