Development of the Mental Health Support Scale: A New Measure of Mental Health First Aid Behaviors.

Mental health first aid (MHFA) courses teach community members the knowledge and skills needed to recognize and respond to mental health problems until professional help is received or the crisis resolves. This study aimed to develop a reliable and valid measure of MHFA behaviors. A pool of actions that were recommended and not recommended were selected from MHFA guidelines and developed into two scales measuring either intended or provided support. Items were tested with a sample of 697 adults. Item response theory guided the selection of final items. The Mental Health Support Scale (MHSS) Intended version has 23 items across two subscales and the MHSS-Provided has 12 items across two subscales. These scales demonstrated convergent validity, discrimination between respondents with and without MHFA expertise, and acceptable measurement precision across a range of skill levels. Overall, findings suggest that the MHSS is a valid and useful measure of MHFA behaviors.