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We used administrative data from emergency departments, hospitals, ambulatory mental health services, Medicare-subsidised services and the Pharmaceutical Benefits Scheme. We defined the overall perinatal period as 140\u2009days before to 365\u2009days after birth. We also examined outcomes within four specific timeframes: 140\u2009days to birth, 1\u201342, 43\u201390 and 91\u2013365\u2009days after birth.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>Across the overall perinatal period, people with intellectual disability who gave birth had greater risk of having at least one mental health emergency department presentation (risk ratio\u2009=\u20097.01 (5.78\u20138.50)), mental health hospital admission (risk ratio\u2009=\u20098.97 (7.54\u201310.67)), ambulatory mental health service contact (risk ratio\u2009=\u20095.55 (4.90\u20136.28)) and Medicare-subsidised mental health service contact (risk ratio\u2009=\u20091.99 (1.82\u20132.16)) than comparators. The most common diagnoses among people with intellectual disability were mood (12.6%; risk ratio\u2009=\u20093.83 (3.38\u20134.35)) and anxiety, stress-related and somatoform disorders (11.9%; risk ratio\u2009=\u20093.62 (3.19\u20134.12)). People with intellectual disability were more likely to be dispensed antipsychotics (risk ratio\u2009=\u20099.29 (7.74\u201311.16)), anxiolytics (risk ratio\u2009=\u20093.03 (2.44\u20133.76)), hypnotics\/sedatives (risk ratio\u2009=\u20092.08 (1.55\u20132.78)), antidepressants (risk ratio\u2009=\u20092.30 (2.13\u20132.49)) and psychostimulants (risk ratio\u2009=\u20094.00 (2.03\u20137.89)).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Our findings show elevated use of mental health services by people with intellectual disability in the perinatal period and underscore the need for accessible and adequately equipped acute and community-based mental health services.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/00048674261490053","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T03:12:21Z","timestamp":1791429141000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Perinatal mental health outcomes for people with intellectual disability: A data linkage study in New South Wales, Australia"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8026-2155","authenticated-orcid":false,"given":"Rachael C.","family":"Cvejic","sequence":"first","affiliation":[{"name":"National Centre of Excellence in Intellectual Disability Health, Faculty of Medicine &amp; 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Health, UNSW Sydney, NSW, Australia"},{"name":"School of Medicine and Public Health, University of Newcastle, NSW, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6567-5186","authenticated-orcid":false,"given":"Nicole","family":"Reilly","sequence":"additional","affiliation":[{"name":"Perinatal and Women\u2019s Mental Health Unit, St John of God Burwood Hospital, NSW, Australia"},{"name":"Graduate School of Medicine, Faculty of Science, Medicine and Health, University of Wollongong, NSW, Australia"},{"name":"Discipline of Psychiatry and Mental Health, School of Clinical Medicine, Faculty of Medicine and Health, UNSW Sydney, NSW, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4785-0224","authenticated-orcid":false,"given":"Simone","family":"Reppermund","sequence":"additional","affiliation":[{"name":"Discipline of Psychiatry and Mental Health, School of Clinical Medicine, Faculty of Medicine and Health, UNSW Sydney, NSW, Australia"},{"name":"Centre for Healthy Brain Ageing, Discipline of Psychiatry and Mental Health, School of Clinical Medicine, Faculty of Medicine &amp; 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