. 2018 Jan 24;45(1):69–79. doi: 10.1093/schbul/sbx197

Table 1.

Selection of Negative Symptoms From Electronic Health Records and Their Equivalence to the Marder Negative Factor Items Within the PANSS

Items Extracted From Electronic Health Record	PPV/Sensitivity	Marder Negative Factor Items Within the PANSS
Blunted affect	0.93/0.83	N1. Blunted affect
Emotional withdrawal	0.85/0.74	N2. Emotional withdrawal
Poor rapport	0.91/0.77	N3. Poor rapport
Social isolation	0.94/0.96	N4. Passive apathetic social withdrawal
Social isolation	0.94/0.96	G16. Active social avoidance
Poverty of speech	0.80/0.73	N6. Lack of spontaneity and conversation flow
Mutism	0.99/0.94	N6. Lack of spontaneity and conversation flow
Psychomotor retardation (dropped^a)	0.55/0.65	G7. Motor retardation

Note: PANSS, Positive and Negative Syndrome Scale; PPV, positive predictive value.

^aDropped from the study due to low PPV (0.55) and sensitivity (0.65) of the “free text” extraction tool, and due to its being recorded mainly as secondary negative symptom.