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Primary mental healthcare: a Dutch database study633to the NIVEL and SN governance code. Results are reported in accordance with the RECORD statement.Figure 3.1. Composition of groupsNIVEL-PCD: Netherlands Institute for Health Services Research Primary Care Database; SNMID database: Statistical Netherlands Mild Intellectual Disability database; MID: Group with mild intellectual disability; Without-ID: Group with no-intellectual disability; MH: people who had one or more MH problems coded with an ICPC-P other than P85; Match: Match control group; MID-MH: Group with mild intellectual disability and a mental health problem; Match-MH: Match control group with MH problem.OutcomesThe MID was considered ‘registered’ by the GP if the person had a P85 code in the NIVEL-PCD. To calculate the period prevalence of MH problems, MH illness episodes were constructed according to Nielen et al.’s algorithm.16MH problems were divided into MH complaints with an ICPC code P1 to P29, and MH disorders with a code P70 to P99. We calculated the prevalence of unique MH problems and the median number of unique MH problems per patient during the research period. Additionally, ICPC codes relating to either psychosis or substance abuse were respectively combined and calculated per patient.Katrien Pouls sHL.indd 63 24-06-2024 16:26