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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Psychooncology. 2014 Sep 25;24(9):1012–1019. doi: 10.1002/pon.3682

Table 2.

Post-Surgical Quality of life for Abstinent versus Smoking Patients

CES-Depression Model A Model B Model C
Predictor B 95% CI p B 95% CI p B 95% CI p
Smoking Status −3.64 −5.52, −1.75 .000 −2.81 −4.72, −0.90 .007 −1.93 −3.58,−0.28 .028
Smoking Status*Month 0.09 −0.17, 0.36 .484 0.09 −0.17, 0.36 .393 0.18 −0.08, 0.44 .180
Smoking Status*Cancer Type −0.00 −3.81, 3.81 .867 1.71 −2.20, 5.62 .486 −0.80 −4.19, 2.60 .653
Month 0.12 0.00, 0.24 .050 0.12 0.00, 0.24 .054 0.11 0.00, 0.22 .061
Cancer Type −1.06 −2.95, 0.83 .274 −1.33 −3.28, 0.62 .184 −1.75 −3.50,−0.01 .050
Month*Cancer Type −0.26 −0.52, 0.00 .059 −0.26 −0.51, 0.00 .058 −0.27 −0.53,−0.02 .039
Gender 2.61 0.74, 4.48 .009 1.74 0.14, 3.34 .038
Age −0.48 −0.14, 0.04 .340 0.00 −0.07, 0.07 .762
Stage 0.65 −0.18, 1.47 .132 0.39 −0.31, 1.08 .285
Gender*Cancer Type 4.29 0.54, 8.03 .028 2.42 −0.95, 5.79 .160
Baseline 0.23 0.16, 0.30 .000
Income −0.57 −0.98,−0.17 .010
Income*Month −0.11 −0.17,−0.14 .003
Income*Cancer Type 1.05 0.20, 1.91 .019
BFI-Fatigue Model A Model B Model C
Predictor B 95% CI p B 95% CI p B 95% CI p
Smoking Status −5.72 −10.3,−1.13 .018 −5.73 −10.4,−1.07 .021 −3.05 −7.32, 1.22 .172
Smoking Status*Month −0.31 −1.00, 0.39 .389 −0.30 −0.99, 0.39 .396 −0.17 −0.90, 0.55 .651
Smoking Status*Cancer Type 0.96 −8.19, 10.1 .795 1.52 −7.62, 10.7 .734 −3.01 −11.6, 5.56 .498
Month −0.09 −0.40, 0.22 .572 −0.09 −0.41, 0.22 .554 −0.11 −0.42, 0.20 .482
Cancer Type −0.69 −5.25, 3.88 .793 −0.30 −5.29, 4.69 .840 −1.39 −6.09, 3.30 .566
Month*Cancer Type −0.23 −0.92, 0.46 .521 −0.23 −0.92, 0.46 .512 −0.27 −0.97, 0.42 .444
Gender 2.35 −2.27, 6.98 .321 0.77 −3.47, 5.01 .726
Age 0.05 −0.16, 0.27 .622 0.13 −0.05, 0.30 .152
Stage 2.23 0.26, 4.20 .030 1.58 −0.24, 3.39 .089
Stage*Cancer Type −2.25 −6.22, 1.73 .279 −1.46 −5.11, 2.19 .442
Baseline 0.37 0.22, 0.52 .000
Income −1.22 −2.41,−0.03 .050
Income*Month −0.15 −0.34, 0.05 .173
Income*Cancer Type 1.65 −0.65, 3.95 .139
BPI-Severity Model A Model B Model C
Predictor B 95% CI p B 95% CI p B 95% CI p
Smoking Status −1.39 −4.21, 1.43 .338 −0.71 −3.43, 2.02 .617 1.40 −1.02, 3.82 .260
Smoking Status*Month 0.08 −0.26, 0.42 .643 0.08 −0.26, 0.41 .648 0.20 −0.13, 0.54 .242
Smoking Status*Cancer Type 1.41 −4.21, 7.04 .627 2.72 −2.46, 7.91 .311 0.48 −3.67, 4.62 .799
Month 0.05 −0.11, 0.22 .510 0.05 −0.11, 0.22 .514 0.05 −0.11, 0.21 .537
Cancer Type −3.57 −6.37, −0.76 .016 −2.84 −5.75, 0.08 .064 −4.30 −6.83, −1.77 .002
Month*Cancer Type −0.03 −0.36, 0.31 .836 −0.03 −0.37, 0.30 .826 −0.08 −0.40, 0.24 .651
Gender 2.44 −0.34, 5.21 .090 1.75 −0.66, 4.16 .162
Age −0.11 −0.25, 0.02 .118 −0.04 −0.13, 0.06 .482
Stage 1.34 0.21, 2.47 .025 0.48 −0.46, 1.41 .320
Baseline 0.37 0.25, 0.48 .000
Income −0.81 −1.43, −0.20 .018
Income*Month −0.16 −0.24, −0.07 .001
Income*Cancer Type 2.28 1.15, 3.41 .000

Notes. Smoking status is coded abstinent at all follow-ups [1] and not abstinent at all follow-ups [0].

Cancer Type is coded as Head/neck [0] and Thoracic [1]. Gender is coded as Male [0] and Female [1].

CES = Center for Epidemiological Studies, BFI = Brief Fatigue Inventory scale, BPI = Brief Pain Inventory

Model A: The base model assesses abstinent versus not abstinent in the context of Cancer Type (H/N vs. Thoracic) and Month (2, 4, 6, 12).

Model B: This model assesses abstinent versus not abstinent after adding 3 traditional control variables (Age, Gender, & Stage) to the base model (A).

Model C: This model assesses abstinent versus not abstinent after adding 2 variables found to be a predictor of the outcome measure in preliminary analyses – baseline QofL measure and income – to Model B.