. Author manuscript; available in PMC: 2013 Sep 16.

Published in final edited form as: Addict Behav. 2009 Dec 3;35(4):331–336. doi: 10.1016/j.addbeh.2009.11.005

Table 5.

Means (SD) and Bivariate correlations showing the criterion-related validity of the LDQ

	Mean (SD)	1	2	3	4	5	6	7
1. DSM Symptoms^a	11.85 (6.81)	-	.424^**	−.235^**	.275^**	.285^**	.305^**	.331^**
2. LDQ	18.05 (8.24)		-	−.315^**	.437^**	.472^**	.398^**	.512^**
3. PDA	21.52 (25.33			-	−.291^**	−.125	−.200^**	−.216^**
4. BSI Somatic	55.06 (11.34)				-	.502^**	.684^**	.795^**
5. BSI Depression	64.19 (10.96)					-	.653^**	.864^**
6. BSI Anxiety	61.65 (10.94)						-	.891^**
7. BSI Global Index	62.94 (10.31)							-

^**

p=<.001. Notes.

Sum of symptoms met across substance classes. LDQ: Leeds Dependence Questionnaire; BSI: Brief Symptom Inventory.