Smoking severity. The questions about number of cigarettes a day and time to first cigarette (included in Studies 1 and 2) were supplemented with the remaining items of the Fagerström Test for Nicotine Dependence (Heatherton et al., 1991). Unreported measures. The main study included the 6-item gain discounting measure used in the Pilot Study. The original test (Du et al., 2002) includes 6 items for 7 different delays and 2 different reward magnitudes, whereas the present version only asked 6 questions in total, which is why results for this test was not included in the main article.
Supplementary Results Table S3 presents the means and standard deviations of proportions of delayed choices according to condition (gain vs. cost), smoking status, and AUDIT status. Proportions of responses have been found to …show more content…
A set of choices between an immediate amount of $300 and delayed amounts, increasing from $150 to $900 were given for three different delays: one year, one month, and ten years (random order). The increments were $25 from $150 to $400, $50 from $400 to $600 and $100 from $600 to $900. Participants were randomly assigned to conditions, with approximately half the sample receiving choices framed as costs, and another half receiving choices framed as gains. For consistent switches between preferences for immediate vs. delayed responses (with no missing or inconsistent responses) the indifference points were coded as the mean between the two delayed amounts at the switch. When at least one of the responses were missing or inconsistent, but the responses still indicated a clear shift between immediate and delayed choices, the indifference point was decided by the author (for each delay and condition the switch point was determined for between 6 and 11 participants). For instance, one participant preferred the delayed amounts from $150 to $250, the immediate amount at $275, the delayed amount at $300, and then switched back to consistent
Supplementary Results Table S3 presents the means and standard deviations of proportions of delayed choices according to condition (gain vs. cost), smoking status, and AUDIT status. Proportions of responses have been found to …show more content…
A set of choices between an immediate amount of $300 and delayed amounts, increasing from $150 to $900 were given for three different delays: one year, one month, and ten years (random order). The increments were $25 from $150 to $400, $50 from $400 to $600 and $100 from $600 to $900. Participants were randomly assigned to conditions, with approximately half the sample receiving choices framed as costs, and another half receiving choices framed as gains. For consistent switches between preferences for immediate vs. delayed responses (with no missing or inconsistent responses) the indifference points were coded as the mean between the two delayed amounts at the switch. When at least one of the responses were missing or inconsistent, but the responses still indicated a clear shift between immediate and delayed choices, the indifference point was decided by the author (for each delay and condition the switch point was determined for between 6 and 11 participants). For instance, one participant preferred the delayed amounts from $150 to $250, the immediate amount at $275, the delayed amount at $300, and then switched back to consistent