2.2. Participants
neurodevelopmental disorder, neurodevelopmental disorders, intellectual disability
Convenience sampling was carried out based on the availability of participants. The eligibility requirements included being over 18 years old, not currently receiving psychological treatment, being fluent in Spanish, and having a child diagnosed with a neurodevelopmental disorder or intellectual disability. The participants did not receive any financial incentive for participating. Twenty parents were recruited through a non-governmental organization for those affected by neurodevelopmental disorders in the region of Madrid, of whom 10 were assigned to the intervention condition and 10 to the control condition (see CONSORT flow diagram, 