Table 3 Positive predictive values for self-reported diagnoses of schizophrenia and subsequent research interview diagnoses.

Self-report method	Research interview diagnosis	Total number of participants	SZ self-report & SZ* research diagnosis	SZ self-report & non-SZ research diagnosis	PPV
Lifetime clinical diagnosis	Schizophrenia	273	190	83	0.70
	Schizophrenia/SA-D		222	51	0.81
	Schizophrenia/SA-D/other psychotic disorders		238	35	0.87
Current clinical diagnosis	Schizophrenia	239	176	63	0.74
	Schizophrenia/SA-D		202	37	0.85
	Schizophrenia/SA-D/other psychotic disorders		215	24	0.90
Participant opinion	Schizophrenia	102	77	25	0.75
	Schizophrenia/SA-D		84	18	0.82
	Schizophrenia/SA-D/other psychotic disorders		87	15	0.85

Positive predictive values for self-reported schizophrenia diagnoses in NCMH. Columns represent the self-reported method, the research interview diagnoses, the total number of participants, and the number of individuals who had a (i) schizophrenia self-reported and subsequent schizophrenia (plus SA-D/other psychotic disorders) research diagnosis, (ii) schizophrenia self-report and non-schizophrenia research diagnosis and PPV.
PPV positive predictive value, SZ schizophrenia, SA-D schizoaffective disorder depressive-type. * Schizophrenia, schizophrenia/SA-D, and Schizophrenia/SA-D/other psychotic disorders combinations tested.

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