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. 2018 Mar 14;21(6):784–791. doi: 10.1093/ntr/nty042

Table 4.

Predictive validity of purchase tasks for factory-made cigarette (FMC) and electronic cigarette (EC) use at follow-up

Smoking cessation outcomes (predictors based on FMC purchase task) EC use outcomes (predictors based on EC purchase task)
Quit status Relapse status Any use
between waves
EC purchase
between waves
Past 30 Days Use
OR 95% CI OR 95% CI OR 95% CI OR 95% CI OR 95% CI
Intensity .97* (.94–.99) 1.05** (1.02–1.10) 1.03* (1.01–1.05) 1.02 (.99–1.06) 1.02 (.98–1.07)
Pmax .99 (.81–1.22) 1.05 (.82–1.35) 1.45* (1.05–1.99) 1.85** (1.25–2.72) 2.01** (1.23–3.30)
Breakpoint .89 (.74–1.06) 1.19 (.96–1.49) 1.19* (1.02–1.38) 1.28* (1.05–1.57) 1.36* (1.05–1.77)
Essential value .45* (.21-.97) 2.55 (.98–6.63) 3.96** (1.46–10.70) 6.63** (1.68–26.14) 6.34* (1.09–36.75)

Data from daily smokers in the Netherlands collected in April 2014 and July 2015.

Quit Status sample size: n = 782

Relapse Status sample size: n = 242

EC Use sample size: n = 645

Adjusted models included: sex, age, roll-your-own smoking status, motivation to quit, and heaviness of smoking index; cessation outcomes also included baseline EC use in the past 30 days

*p < .05; **p < .01