Table 1.

Range of Psychometric Tests Statistics for PRBQ^a Across Four Time Points

	Reliability			Concurrent Validity			Predictive Validity
PRBQ Predictorsc	Meanc	Internal	Test-retest	Correlation with other scales			Prediction of quit attempt	Prediction of abstinence
		(Cronbach's alpha)	(Intraclass correlation coefficient)	Self- efficacy (Pearson r)	Addiction rating (Pearson r)	Intent to quit (Point biserial)	T statistic	T statistic
Total Risks	4.8 - 4.8	.88 - .93	.67 - .75	−.35 to −.47	.31 to .40	−.28 to −.19	−1.7	−1.6
Weight gain	4.8 - 5.1	.86 - .90	.74 - .75	−.09 to −.22	.08 to .27	−.04 to −.22	−0.2	−0.3
Negative affect	5.1 - 5.2	.75 - .88	.53 - .65	−.31 to −.44	.28 to .38	−.11 to −.27	−1.1	−1.8
Attention	4.1 - 4.2	.96 - .98	.52 - .67	−.16 to −.35	.12 to .26	−.32 to 0	−1.8	−0.5
Negative social	3.1 - 3.3	.56 - .64	.51 - .62	−.20 to −.32	.13 to .22	−.14 to −.05	0.9	−0.3
Loss of enjoyment	5.1 - 5.3	.70 - .89	.54 - .65	−.21 to −.34	.25 to .34	−.20 to −.09	−2.2	−2.2
Craving	6.1 - 6.2	.91 - .96	.42 - .62	−.41 to −.55	.43 to .59	−.22 to −.14	−1.6	−1.9
Total Benefits	6.2 - 6.3	.93 - .96	.78 - .80	−.14 to .03	.03 to .23	−.08 to .07	0.5	−0.6
Long-term health	6.2 - 6.2	.85 - .93	.61 - .68	−.27 to .02	−.02 to .18	−.12 to .04	−0.4	−0.6
Wellbeing	6.0 - 6.2	.88 - .92	.65 - .71	−.11 to −.01	.02 to .20	−.07 to .06	−0.4	−1.1
Self esteem	6.3 - 6.4	.91 - .93	.71 - .79	−.09 to .11	−.08 to .22	−.01 to .04	0.9	−0.01
Finances	6.3 - 6.5	.63 - .69	.48 - .64	−.09 to −.02	−.07 to .22	−.11 to .09	0.2	−1.4
More physical appeal	6.5 - 6.7	.84 - .96	.54 - .79	−.14 to .08	.03 to .40	−.06 to .08	0.8	−0.4
Positive social	6.2 - 6.3	.79 - .84	.62 - .78	−.11 to .02	.03 to .26	0 to .17	1.1	−0.3
Benefits minus Risksd	1.4 – 1.5	N/A	.66 - .74	.21 to .43	−.18 to −.31	.12 to .28	1.8	0.9

^aPRBQ = Perceived Risks and Benefits of Quitting

^bBold values, p < .05

^cAll rated 1-7

^dPositive values = Mean Benefits Score > Mean Risks Score