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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






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