Table 2.

Mean IQ in marijuana user groups

IQ subtestRFAB, IQMTFS, IQ
Baseline (age 9–10 y)Follow-up (age 19–20 y)Baseline (age 11–12 y)Follow-up (age 17–19 y)
MeanSDMeanSDMeanSDMeanSD
Vocabulary
 Nonusers100.215.0102.014.8100.715.3102.015.1
 Users99.915.098.115.098.814.396.314.1
Information
 Nonusers101.215.0102.315.0
 Users97.914.796.414.2
Similarities
 Nonusers100.814.9100.614.9
 Users99.515.099.415.1
Block Design
 Nonusers100.714.9100.714.8100.715.0100.915.3
 Users99.515.199.315.298.714.998.314.3
Matrix Reasoning
 Nonusers101.215.1100.215.2
 Users99.214.999.914.9
Picture Arrangement
 Nonusers100.315.2100.215.3
 Users99.514.699.814.6
  • N values are presented in Table S3.