To what extent does the anxiety scale of the Four-Dimensional Symptom Questionnaire (4DSQ) detect specific types of anxiety disorder in primary care? A psychometric study

Table 2 Description of the datasets

Study	A	B	C	D	E
Numbers^a	295	170	118	156	230
Gender (% female)	60.3	72.4	64.4	61.5	67.8
Age [mean (SD)]	39.5 (9.2)	44.9 (15.9)	49.5 (11.2)	38.1 (12.1)	43.5 (7.5)
4DSQ scores [mean (SD)]
- Distress (range 0–32)	22.9 (7.2)	21.0 (7.5)	19.4 (7.1)	19.8 (9.2)	20.7 (9.0)
- Depression (range 0–12)	4.0 (3.4)	4.3 (3.8)	3.7 (3.1)	4.4 (4.0)	4.9 (4.4)
- Anxiety (range 0–24)	5.9 (5.4)	5.9 (5.8)	7.0 (5.2)	6.6 (6.3)	9.4 (7.3)
- Somatization (0–32)	14.2 (6.9)	12.7 (7.2)	14.2 (6.9)	12.0 (8.0)	14.7 (7.7)
DSM-IV diagnoses (%)
- Panic disorder^b	7.8	8.8	26.3	26.3	28.7
- Agoraphobia^c	7.1	12.4	32.2	21.8	27.0
- Social phobia	10.8	7.1	22.9	21.2	23.5
- GAD^d	20.7	32.9	18.6	16.7	26.1
- Specific phobia	N/A	17.1	N/A	8.3	N/A
- OCD^e	N/A	N/A	N/A	5.1	17.0
- PTSD^f	N/A	N/A	N/A	3.8	20.0
- Major depressive disorder	49.5	67.1	42.4	50.6	40.0
- Dysthymia	2.4	18.2	12.7	3.8	28.7

^aNumbers of patients refer to those who completed the 4DSQ and a diagnostic interview.
^bPanic disorder without agoraphobia plus panic disorder with agoraphobia.
^cAgoraphobia without history of panic disorder plus panic disorder with agoraphobia.
^dGeneralized anxiety disorder.
^eObsessive compulsive disorder.
^fPost traumatic stress disorder.
N/A: not assessed.

ISSN: 1471-244X