. Author manuscript; available in PMC: 2020 May 1.

Published in final edited form as: Contemp Clin Trials. 2019 Mar 20;80:40–47. doi: 10.1016/j.cct.2019.03.009

Table 3.

Sample Size Estimation

Quit rate: total study sample	Comparing quit rates by group	Odds ratio	Total sample size needed^†
8%	5% vs. 10%	2.10	870
10%	7% vs. 12%	1.80	1078
12%	9% vs. 14%	1.60	1276
14%	11% vs. 16%	1.50	1466

^†

Total N assumes equal group sizes; Power=.80; Alpha=.05