The best predictors of relapse at six months
Table 
Predictors of smoking relapse after six months, in decreasing order of importanceMDA = mean decrease accuracy, a statistical measure indicating the level on the predictor variable importance in the classification machine learning algorithmThe top 10 predictors of smoking relapse between months 1 and 6 were, in this order: the number of different days the app was accessed; intention to quit smoking assessed after one month; number of times the app was opened; perceived usefulness of the app measured after one month; self-report of current use of a smoking cessation app after one month; nicotine medication use at baseline; number of cigarettes/day measured at baseline; number of minutes before first cigarette of the day; e-cigarette use after one month; and duration of app use.