A new psychometric instrument assessing vulnerability to risk of suicide and self-harm behaviour in offenders: Suicide Concerns for Offenders in Prison Environment (SCOPE).

This study aimed to develop a new psychometric instrument to assess vulnerability to risk of suicide and nonfatal self-harm behaviour in young adult male and female offenders. In total three studies were conducted to assess the psychometric properties of the new instrument using both exploratory and confirmatory factor analysis in different samples. Participants in all three studies included a total of 1,166 young adult offenders across six Her Majesty's Prisons. The new instrument, Suicide Concerns for Offenders in Prison Environment (SCOPE), contained 28 items scoring on two subscales. The factorial structure of the new instrument initially obtained with exploratory factor analysis was subsequently confirmed in a new sample. The internal consistency of the two subscales were acceptable but the test-retest reliability coefficients were moderate. Concurrent validation with the Beck Hopelessness Scale was acceptable and SCOPE showed the ability to discriminate between those at risk and those with no known history of attempted suicide and nonfatal self-harm behaviour ( p < 0.01).