{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T03:45:36Z","timestamp":1792122336103,"version":"4.4.0"},"reference-count":63,"publisher":"Oxford University Press (OUP)","issue":"5","license":[{"start":{"date-parts":[[2025,4,14]],"date-time":"2025-04-14T00:00:00Z","timestamp":1744588800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Epidemiological and Social Psychiatric Research Institute"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,9,8]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:sec>\n                  <jats:title>Background and Hypothesis<\/jats:title>\n                  <jats:p>Psychotic symptoms are common in adolescents and predictive of psychiatric disorders. Numerous risk factors have been shown to precede psychiatric disorders. However, investigating individual risk factors does not account for the cumulative effect these risk factors may have. Therefore, we combined well-researched environmental risk factors for psychotic disorder in a composite measure: the poly-environmental risk score (PERS).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Study Design<\/jats:title>\n                  <jats:p>Risk factors were assessed in a cohort of 801 adolescents (aged 15) at risk for psychopathology. Binarized risk factors included winter birth, low gestational age, low birth weight, ethnic minority status, urban living environment, cannabis use, victim of bullying, emotional abuse, physical abuse, sexual abuse, high paternal age, parental severe mental illness, parental divorce, and parental death. The PERS was weighted with the log odds derived from recent meta-analyses. At age 18, self-reported psychotic experiences (PE) and clinician-rated psychotic symptoms (PS) were assessed. This updated PERS was compared to previous PERS models, which included fewer risk factors and different weightings.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Study Results<\/jats:title>\n                  <jats:p>The PERS was associated with PE and PS. Specifically, a PERS between 3 and 4, and PERS &amp;gt; 4 corresponded with a 2.2- and 5.2-fold increase in the odds of psychotic symptoms in late adolescence. The updated 14-item PERS performed better compared to previous compositions of the PERS.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>A composite score of childhood and adolescent risk factors measured at age 15 was associated with psychotic symptoms at age 18. Future research should consider the cumulative effect of risk factors when examining the determinants of psychopathology.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/schbul\/sbaf046","type":"journal-article","created":{"date-parts":[[2025,4,14]],"date-time":"2025-04-14T10:07:31Z","timestamp":1744625251000},"page":"1464-1472","source":"Crossref","is-referenced-by-count":2,"title":["Combining the Risk: The Poly-Environmental Risk Score and Psychotic Symptoms in Adolescents"],"prefix":"10.1093","volume":"51","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5035-1528","authenticated-orcid":false,"given":"Diandra C","family":"Bouter","sequence":"first","affiliation":[{"name":"Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Susan J","family":"Ravensbergen","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nita G M","family":"de Neve-Enthoven","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sibel","family":"Ercan","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benno","family":"Bakker","sequence":"additional","affiliation":[{"name":"Epidemiological and Social Psychiatric Research Institute (ESPRi), Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]},{"name":"Parnassia Psychiatric Institute,\u00a03009 AM , Rotterdam,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark H","family":"de Jong","sequence":"additional","affiliation":[{"name":"Epidemiological and Social Psychiatric Research Institute (ESPRi), Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]},{"name":"Yulius Mental Health,\u00a03300 BA , Dordrecht,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Witte J G","family":"Hoogendijk","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, Erasmus MC, University Medical Center Rotterdam , 3000 CA,\u00a0Rotterdam,","place":["The Netherlands"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1085-5534","authenticated-orcid":false,"given":"Nina H","family":"Grootendorst-van 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