TABLE 2. Effect Size by Year of Study

Year of study

Effect size

≤1989

1990–1999

≥2000

Grand total

≤1989

1990–1999

≥2000


Low 1 5 6 12 16.67% 41.67% 33.33%
Medium 2 3 9 14 33.33% 25.00% 50.00%
High 3 4 3 10 50.00% 33.33% 16.67%
Grand total

6

12

18

36