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Table 1 Power to detect the intervention effect on documented preferences, according to three sources of information (n = 86 dyads per group, two-sided α = 0.05)

From: Promoting advance planning for health care and research among older adults: A randomized controlled trial

Source Odds ratio
(95% CI)
Event rate in
the Control group
Event rate in the Experimental group Power
Bravo et al. [39] 4.0 (1.6 - 10.4) 0.12*   95%
Patel et al. [87] 3.7 (1.5 - 9.4) 0.12*   92%
Pearlman et al. [10]   0.23 0.48 93%
  1. * Derived from 13 RCTs included in our systematic review (mean = 0.12, sd = 0.182, range: 0 to 0.56) and applied to Patel et al. who did not report the mean event rate across control groups.