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Table 2 Sample size required per profession to detect a difference in proportion at α = .05

From: Tobacco brief intervention training for chiropractic, acupuncture, and massage practitioners: protocol for the CAM reach study

  Effect size
1-β 22% (28.0% vs. 50.0%) 25.5% (28.0% vs. 53.5%) 29% (28.0% vs. 57.0%)
.75 31 23 18
.80 35 26 20
.85 41 31 24