INTREPID II is a research programme to study the epidemiology, phenomenology, aetiology and outcome of psychotic disorders in diverse settings. It builds on previously-developed methods for the study of schizophrenia and other psychoses from the INTREPID I pilot study.
In Nigeria, the catchment area includes the following Local Government Areas; Idaban North East, Ibadan South East, and Ona-Ara, in Oyo State. In Trinidad, the catchment area covers the municipalities of Arima, Tunapuna-Piarco, Chaguanas, Port of Spain, San Juan/Laventille and Diego Martin. In India, the catchment area consists of Chengelpettu, Uthiramerur and Maduranthakam taluks, in the state of Tamil Nadu, South India. More information about each catchment area can be found at the respective link.
Aims The overall aim of the five-year research programme is to investigate the variability - in incidence, presentation, outcome, and impact - of psychotic disorders in diverse developing countries. The programme takes place in sites in three countries (India, Nigeria, Trinidad) and consists of four inter-connected studies, aiming to:
(1) investigate the incidence and presentation of untreated psychotic disorders in each site and associated risk factors;
(2) investigate the 2-year course and outcome of psychotic disorders and associated factors;
(3) investigate (a) help-seeking and (b) the impact of psychotic disorders on individuals and families, using a combination of quantitative and qualitative approaches;
(4) investigate the types and prevalence of physical health problems and related risk markers.
What this programme adds
During the pilot project, we developed an extensive network of biomedical and alternative providers as well as local key informants, allowing us to enroll incident cases who utilize health services, as will as detect untreated cases who do not present to formal health services and who may otherwise have been excluded. This will ensure that our sample is as representative as possible, and provide a more comprehensive estimate of the incidence of psychotic disorders.
Instruments that have been tested and adapted in the pilot study (INTREPID I) are used to collect data to address each of the aims above. The use of consistent methods across the three sites is key to enable valid cross-site comparisons.
The INTREPID II study also includes matched controls, allowing us to compare outcomes for people with psychosis with those of their peers in the same setting.
Findings from the INTREPID II programme will further our understanding of the aetiology, presentation and course of psychotic disorders across different populations. The results will inform service delivery and prevention efforts in these settings as well as for diaspora populations living in the UK.
Part of the catchment area in Oyo state, Nigeria
Research design and methods
In each of the three sites, we will identify, assess, and follow at 2 years, cohorts of 240 untreated (incident) persons with a psychotic disorder and, where possible, a close relative of each person, as well as 240 matched controls.
With participants' consent, extensive data will be collected by trained interviewers on clinical, social and biological measures, for both cases and controls. In addition, relatives of the persons with psychoses will be interviewed to collect information about care pathways, family burden and help-seeking. All participants will be followed up 2 years after their inclusion in the study, allowing us to track the course and outcomes of psychotic disorders.
The table below represents the instruments used for collecting data by the interviewers for each of the 4 studies described above:
A full protocol will be published shortly and made available on the "Publications" section of the website. In the meantime, for full details of the study design please feel free to contact the INTREPID team.