Fig. 1
From: Analysis of multicenter clinical trials with very low event rates
Distribution of participants who were randomized (light gray) and who had sustained cessation (black) from smoking for 6 months, across 54 companies in the motivating five-arm randomized trial of workplace smoking cessation programs [3]. A total of 6006 participants were randomized, and 80 achieved sustained cessation, resulting in several companies with no participants quitting either overall or in more than one study arm