Improving screening methods for psychosis in an adolescent help-seeking population using the Child Behavior Checklist (CBCL) and the Youth Self Report (YSR) versus the Prodromal Questionnaire -16 items version (PQ-16)

Table 3 Screening properties of the PQ-16, YSR Thought Problems, CBCL Thought Problems and positive CAARMS outcome (UHR/psychotic threshold) vs. negative CAARMS outcome (no classification), with two cutoff values above and below the chosen cutoff

Questionnaire / cutoff	N reaching the cutoff n = 270	N and % reaching the cutoff in total sample n = 1136	Sensitivity	Specificity	PPV	NPV	True pos	True neg	False pos	False neg
YSR Thought Problems
61	188	393 34.6	0.88	0.45	56.4	82.9	106	68	82	14
62	178	362 31.9	0.83	0.48	56.2	78.3	100	72	78	20
63	169	332 29.2	0.81	0.52	57.4	77.2	97	78	72	23
64	153	288 25.4	0.76	0.59	59.5	75.2	91	88	62	29
65	131	227 20.0	0.65	0.65	59.5	69.8	78	97	53	42
CBCL Thought Problems
64	206	614 54.0	0.93	0.37	53.9	85.9	111	55	95	9
65	193	563 49.6	0.88	0.41	54.4	80.5	105	62	88	15
67	186	524 46.1	0.85	0.44	54.8	78.6	102	66	84	18
68	158	427 37.6	0.77	0.56	58.2	75.0	92	84	66	28
70	131	345 30.4	0.64	0.64	58.8	69.1	77	96	54	43
PQ-total score
5	237	437 38.5	0.97	0.19	48.9	87.9	116	29	121	4
6	225	357 31.4	0.91	0.23	48.4	75.6	109	34	116	11
7	187	287 25.3	0.83	0.42	53.5	75.9	100	63	87	20
8	164	239 21.0	0.78	0.53	56.7	74.5	93	79	71	27
9	129	185 16.3	0.68	0.68	62.8	72.3	81	102	48	39

PPV Positive Predictive Value, NPV Negative Predictive Value, pos positives, neg negatives

ISSN: 1753-2000