Clinical characteristics for PNS patients and non-PNS patients.

<p>Abbreviations: PNS, persistent negative symptoms; SANS, Scale for the Assessment of Negative Symptoms; SAPS, Scale for the Assessment of Positive Symptoms; CDSS, Calgary Depression Scale for Schizophrenia.</p>a<p>Antipsychotic totals presented in chlorpromazine equivalents.</p>b<p>Medication adherence: 0 (never adherent) to 4 (fully adherent).