risk (27.2–34.8%). Stated differently, roughly two-thirds of respondents classified by the risk indices as having the highest risk made attempts (positive predictive value: 66.8–68.7%). The two indices for unplanned attempts have smaller proportions of respondents classified as having highest risk than the indices for planned attempts (3.6–11.6%), lower proportions of attempts made by people classified at highest risk (21.0–49.9%), and smaller proportions of respondents classified at highest risk who made attempts (38.5–46.9%). (Final versions of each risk index are available upon request.)
