Introduction: In recent years, the early detection and treatment of the first episode of schizophrenia (FES) has attracted worldwide attention. In Japan, psychiatric care has changed to an open and accessible framework over the past decade. Therefore, the duration of untreated psychosis (DUP) is thought to have been shortened. The purposes of this study were to investigate whether recent DUP periods are shorter than they were 10 years ago and whether the DUP at present differs among psychiatric facilities. We investigated the recent DUP at a psychiatric hospital and its satellite clinic. Material and methods: We examined the differences in DUP, age, sex, referral pathway, living companions, social participation, and schooling history among 3 groups of FES patients: (i) a psychiatric hospital during 1999–2001 and (ii) during 2009–2011, and (iii) a psychiatric clinic during 2009–2011. Results: The average DUP was 14.3 (SD = 17.5) months for the psychiatric hospital during 1999–2001, 16.0 (SD = 18.7) months for the psychiatric hospital during 2009–2011, and 24.4 (SD = 30.0) months for the psychiatric clinic during 2009–2011. No significant differences were found in the DUP for each facility and during this decade. Also, the differences in the DUP could not be attributed to factors such as living companions or social participation. Discussion: Increases in the numbers of patients and psychiatric clinics have not led to the early detection of FES. To shorten the DUP in the future, closer cooperation among the medical field, the educational field, and the health and welfare will be needed.
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