Abstract
Little is known about New Zealanders who experience obsessive–compulsive disorder (OCD). Using population-level data for people aged 18–64 years, we identified a cohort of 5559 people who accessed secondary health services and had a diagnosis of OCD. We explored their characteristics in comparison to people without OCD. The rate of OCD per 10,000 people differed by ethnicity (European, 24.7; Māori, 13.4; Pacific Peoples, 5.6; Asian, 5.9). We observed variation in OCD rates by the geographic divisions of the public healthcare provider Health NZ which persisted following standardisation for age, sex, ethnicity and urban vs rural residence (Northern, 14.5; 95% confidence interval (CI) 13.7–15.2; Te Manawa Taki, 10.9; CI 10.0–11.8; Central, 19.7, CI 18.5–20.8; Te Waipounamu, 27.4, CI 26.2–28.7). These disparities suggest inequity of access to healthcare. Individuals in this cohort typically had at least one co-occurring mental health or related condition (78.8%) and were less likely to have at least level 4 educational qualifications (equivalent to first year of an undergraduate degree) (adjusted rate ratio (ARR) 0.94; CI 0.90–0.97), to be employed (ARR 0.69; CI 0.66–0.72) and to belong to a higher income bracket ($40,000 or higher, ARR 0.57; CI 0.53–0.62). These findings suggest wider support needs.