Manual for the Benzodiazepine Dependence Questionnaire (BDEPQ)

VALIDITY OF THE BDEPQ 37
Table 9: Multitrait-multimethod matrix: Wave one and phone interview
Dependence Anxiety Depression Neuroticism Pattern of BZD use
BDEPQ BWSQ SRD DSM3R ICD10 BAI BDI EPQ-N Dose 1
2 life Frequency Duration
BDEPQ 0.92
(187)
BWSQ 0.61 0.90
(171) (239)
Dependence SRD 0.51 0.27 0.71
(184) (233) (86)
DSM3R 0.39 0.27 0.33 -
(68) (82) (86)
ICD10 0.37 0.40 0.28 0.50 -
(68) (82) (86) (88)
Anxiety BAI 0.56 0.54 0.23 0.34 0.11 0.88
(179) (230) (241) (88) (88) (249)
Depression BDI 0.50 0.55 0.16 0.20 0.13 0.52 0.84
(187) (238) (254) (87) (87) (248) (247)
Neuroticism EPQ-N 0.48 0.44 0.20 0.14 -0.00 0.53 0.59 0.88
(181) (232) (244) (82) (82) (240) (250) (253)
BZD 0.31 0.23 0.24 0.29 0.29 0.18 0.12 0.06 -
dose (189) (241) (257) (88) (88) (251) (264) (253)
Half- 0.04 -0.02 -0.16 0.01 -0.06 0.06 -0.00 0.04 -0.38 -
Pattern of life (182) (233) (248) (88) (88) (243) (255) (244) (260)
BZD use
Frequency -0.25 -0.15 -0.50 -0.13 -0.05 -0.08 -0.07 -0.03 -0.22 0.15 -
(188) (238) (256) (87) (87) (246) (259) (248) (264) (255)
Duration 0.06 0.03 0.24 -0.11 -0.02 -0.07 -0.09 -0.06 -0.04 0.03 -0.26 -
(188) (234) (252) (88) (88) (242) (259) (244) (259) (253) (258)
Notes: The diagonal contains reliability coe cients which are coe cient alphas except for self-rated dependence which
is a two to three week test-retest correlation. BDEPQ = Benzodiazepine Dependence Questionnaire, BWSQ =
Benzodiazepine Withdrawal Symptom Questionnaire, SRD = Self-Rated Dependence, DSM3R = a current DSM3R
diagnosis of Benzodiazepine Dependence made using the CIDI, ICD10 = a current ICD10 diagnosis of Benzodiazepine
Dependence made using the CIDI, BAI = Beck Anxiety Inventory, BDI = Beck Depression Inventory, EPQ-N =
Neuroticism scale of the Eysenck Personality Questionnaire, Dose = high estimate of diazepam-equivalent dose of
BZDs, Half-life = dose weighted average half-life of BZDs taken, Frequency = how often were BZD taken, and
Duration = for how long were BZDs taken.