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Table 2 Estimated power with a total sample size of 4,000 comparing primary outcome measures between the screening group and the no screening group (two-sided at α = 0.05) allowing 10% of patients with missing outcomes at 12 months

From: The Indiana University Cognitive Health Outcomes Investigation of the Comparative Effectiveness of dementia screening (CHOICE) study: study protocol for a randomized controlled trial

Effect size of collaborative care in demented subjects

Effect size in non-demented subjects

Observable effect size

Power estimate

0.3

0.07

0.091

77.9

 

0.08

0.100

85.1

0.4

0.07

0.102

86.4

 

0.08

0.110

91.0