Table 2 PER2 genotype frequencies in subpopulations

From: Repeat variation in the human PER2 gene as a new genetic marker associated with cocaine addiction and brain dopamine D2 receptor availability

 

Genotype

 

4R/4R

4R/3R

3R/3R

4R/2R

3R/2R

2R/2R

African Americans (N=286)

148 (51.1%)

85 (30.1%)

20 (7.1%)

22 (7.8%)

5 (1.8%)

6 (2.1%)

Non-Africans (N=223)

197 (88.2%)

20 (8.7%)

3 (1.3%)

3 (1.3%)

0

1 (0.4%)

  1. Abbreviation: PER2, Period 2.
  2. Actual counts of genotype in subpopulations are shown along with percentiles (within parenthesis).
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