Table 1

Univariate predictors of nicotine boost

A. Mean and SD
PredictorLevelBoostBaseline cotinineBaseline nicotine
Median (SD)Median (SD)Median (SD)
RaceCaucasian10.2 (5.2)a271.3 (116.6)b18.9 (10.5)
African American12.3 (5.3)343.1 (157.7)21.3 (9.9)
GenderMale11.1 (5.5)315.1 (151.0)b20.58 (11.1)c
Female10.6 (4.8)263.0 (101.0)18.0 (8.9)
Education< College11.4 (5.1)304.8 (131.1)20.0 (9.4)
≥ College10.4 (5.1)275.7 (129.6)18.7 (10.7)
Smoking rate1–10 cpd11.6 (4.4)c257.1 (99.3)16.6 (5.0)
11–20 cpd11.5 (5.4)278.2 (121.2)19.0 (10.9)
21–30 cpd9.8 (4.7)307.4 (163.8)19.1 (9.9)
>30 cpd9.1 (4.3)328.8 (118.3)22.7 (8.3)
Menthol cigarettesYes11.2 (5.5)316.5 (147.5)c20.9 (10.3)
No10.8 (5.0)276.5 (119.2)19.3 (10)
Cigarette typeLight10.5 (4.9)266.7 (120.4)a17.8 (8.8)b
Regular11.7 (5.4)315.8 (135.0)22.2 (11.0)
B. R and predictors
BoostBaseline cotinineBaseline nicotine
rrr
Age−0.14c0.15a0.02
Nicotine dependence−0.070.29b0.22b
Body mass index0.13−0.130.15c
Nicotine/cotinine0.11−0.24b0.47b
Baseline cotinine level0.12c0.61b
Baseline nicotine level0.14a0.61b
FTC nicotine delivery0.120.100.24b
Depression symptoms−0.060.04−0.07
Negative affect−0.03−0.01−0.10
Positive affect0.15a−0.07−0.02
  • a P < 0.05.

  • b P < 0.01.

  • c P < 0.10.