. Author manuscript; available in PMC: 2021 Mar 31.

Published in final edited form as: Psychol Assess. 2021 Mar;33(3):255–266. doi: 10.1037/pas0000978

Table 7.

Predictive Validity of Residualized WSWS2 Change Scores: Logistic Regressions of Week 4 and Week 26 Abstinence in the WSHS2 Study

Residualized Composite Scores	Week 4 Self-Reported Abstinence		Week 26 CO-Confirmed Abstinence
Residualized Composite Scores	Wald (p-value)		Wald (p-value)
WSWS2-L Total Score (19 Items)	9.66 (p=.0019)		1.11 (p=.2918)
WSWS2-B (6 Items)	7.40 (p=.0065)		1.07 (p=.3000)

	Week 4 Self-Reported Abstinence		Week 26 CO-Confirmed Abstinence
Residualized WSWS2-L Subscales	Univariate Model	Multivariate Model	Univariate Model	Multivariate Model
Residualized WSWS2-L Subscales	Wald (p-value)	Wald (p-value)	Wald (p-value)	Wald (p-value)
Negative Affect	11.97 (p=.0005)	3.67 (p=.0544)	0.90 (p=.3416)	0.04 (p=.8367)
Hunger	0.62 (p=.4305)	0.21 (p=.6444)	0.23 (p=.6322)	0.01 (p=.9316)
Craving	31.98 (p<.0001)	24.65 (p<.0001)	9.83 (p=.0017)	10.53 (p=.0012)
Sleep	1.03 (p=.3097)	0.14 (p=.7092)	0.47 (p=.4940)	0.12 (p=.7247)
Restlessness	0.61 (p=.4362)	2.05 (p=.1514)	0.50 (p=.4792)	3.25 (p=.0715)
Concentration	1.32 (p=.2502)	0.58 (p=.4477)	0.07 (p=.7897)	0.02 (p=.8953)

Note. WSWS2-L = 19-item Wisconsin Smoking Withdrawal Scale 2. WSWS2-B = 6-item Brief Wisconsin Smoking Withdrawal Scale 2. All models include treatment as a predictor. The residualized change scores were computed as post-quit week 1 scores residualized on pre-quit week −1 scores. The Univariate Model includes only the single subscale and treatment as predictors. The Multivariate Model includes all six subscale and dummy-coded treatment as predictors.