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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Oct 30;158:30–37. doi: 10.1016/j.drugalcdep.2015.10.024

Table 4.

Trimmed multiple predictor HLM model of the effects of predictors (t0) on smoking outcome (t1)

Fixed Effect Coefficient SE OR 95% CI T-ratio Approx. df p-value
Temptation vs. Abstinent
Intercepta −0.06 0.24 0.94 [0.58-1.54] −0.22 105 0.820
    Baseline Nicotine Dependencea,b 0.04 0.02 1.04 [1.01-1.08] 2.54 105 0.013
Recent smoking (prior to t0, 1=yes, 0=no) −0.19 0.16 0.82 [0.60-1.12] −1.22 3206 0.223
Time between reports (t0 to t1) 0.02 0.02 1.02 [0.96-1.08] 0.79 3206 0.428
Time since quit day (0=week 1; 1=week 2-3) −0.77 0.12 0.46 [0.36-0.58] −6.59 3206 <.001
Agitationa 0.20 0.09 1.22 [1.02-1.48] 2.18 106 0.031
Distress −0.05 0.10 0.95 [0.78-1.14] −0.52 3206 0.600
Urgea 0.48 0.08 1.60 [1.35-1.92] 5.42 106 <.001
Alcohola −0.46 0.52 0.62 [0.22-1.74] −0.90 106 0.367
Smoking vs. Temptation
Intercepta −0.94 0.23 0.39 [0.24-0.62] −4.04 105 <.001
    Baseline Nicotine Dependencea,b −0.004 0.02 1.00 [0.96-1.03] −0.21 105 0.834
Recent smoking (prior to t0, 1=yes, 0=no) 1.24 0.14 3.46 [2.58-4.63] 8.37 3206 <.001
Time between reports (t0 to t1) 0.14 0.03 1.15 [1.08-1.23] 4.18 3206 <.001
Time since quit day (0=week 1; 1=week 2-3) 0.56 0.13 1.75 [1.35-2.28] 4.22 3206 <.001
Agitationa −0.28 0.10 0.75 [0.60-0.92] −2.70 106 0.008
Distress 0.26 0.10 1.30 [1.06-1.60] 2.58 3206 0.010
Urgea −0.14 0.10 0.87 [0.72-1.06] −1.40 106 0.164
Alcohola 1.31 0.49 3.71 [1.40-9.89] 2.66 106 0.009

Multiple predictor HLM model including level one and level two covariates. Non-significant variables were pruned from the model. SE=Standard Error. OR=Odds Ratio. 95%CI=confidence interval.

a

Random coefficient. All other predictors were treated as fixed to facilitate model parsimony and convergence.

b

Baseline nicotine dependence measured by the total score on the WISDM-68. Similar results are obtained using the FTND total score (temptation vs. abstinent: coefficient=0.22, SE=0.09, OR=1.24, 95% CI [1.02-1.50], t(105)=2.28, p=.02; smoking vs. temptation: coefficient=0.02, SE=0.09, OR=1.02, 95% CI [0.85-1.22], t(105)=0.24, p=.80).