Table 2.

Effect of the Variables Related to Patients Sampling

	OCD	PD	AGO	PTSD	SP	SPP	GAD
Systematic vs Non-systematic
Systematic (%/m)	8.4/3	9.1/4	22.2/2	14.4/3	38.6/2	30.4/2	26.6/2
Not systematic (%/m)	12.4/31	10.0/19	4.3/10	12.0/17	13.9/14	6.5/9	9.9/12
Difference (χ2)	3.54	0.23	30.63	0.97	23.86	38.47	14.16
P value (2 tailed)	NS	NS	<.001	NS	<.001	<.001	<.001
SZ only vs SZ and other
SZ only (%/m)	11.3/15	16.3/10	7.8/4	21.8/8	12.9/6	9.5/3	16.7/6
SZ and other (%/m)	12.9/19	7.3/13	3.8/8	7.8/12	16.6/10	7.0/8	7.9/8
Difference (χ2)	1.96	25.91	6.44	54.77	3.35	1.69	16.37
P value (2 tailed)	NS	<.001	.022	<.001	NS	NS	<.001
OP vs IP
OP (%/m)	16.9/11	11.9/12	5.6/7	14.1/13	22.8/9	5.8/6	7.1/8
IP (%/m)	10.7/14	6.3/5	5.6/4	15.2/4	8.7/5	10.5/3	11.3/3
Difference (χ2)	15.03	8.50	0.00	0.15	38.67	5.26	2.91
P value (2 tailed)	<.001	.007	NS	NS	<.001	.044	NS
Percentage of men in the sample
m	29	17	8	14	13	8	11
R	−.21	−.22	−.24	−.65	−.28	−.59	−.42
P value	NS	NS	NS	0.012	NS	NS	NS
Mean age
m	32	20	10	15	14	9	12
R	.06	.45	.36	.32	.29	−.69a	−.49
P value	NS	.045	NS	NS	NS	.038	NS
FEP vs Not FEP
FEP (%/m)	8.0/6	3.2/3	0.0/2	9.8/3	13.4/2	NA/0	0.0/1
Not FEP (%/m)	13.0/28	11.8/20	6.0/10	12.9/7	15.2/14	07.9/11	11.6/13
Difference (χ2)	11.04	19.94	5.52	1.61	0.47	NA	7.80
P value (2 tailed)	.002	<.001	.038	NS	NS	NA	.010

Note: OCD, obsessive-compulsive disorder; PD, panic disorder; AGO, agrophobia; PTSD, post-traumatic stress disorder; SP, social phobia; SPP, simple phobia; GAD, generalized anxiety disorder; m, number of studies; SZ, schizophrenia; OP, outpatients; IP, inpatients; FEP, first-episode psychosis; NS = P > .1; NA, not applicable.

^aThis counterintuitive effect is driven by one study in adolescents with SZ. When that study is disregarded, the correlation becomes positive although nonsignificant (r = .17).