Table 6. Cronbach’s alphas and coefficient of two halves of the general scale and of the subscales.

Scale	Alpha	Correlation between parts	Two halves
Full scale.	.93	.75	.84
Trend.	.94	.84	.91
Reasons.	.94	.77	.86
Beliefs.	.90	.84	.91
Negative consequences.	.90	.79	.88
Positive consequences.	.79	.53	.66