The summary risk indices, which are made up of the significant predictors from multivariate versions of the foregoing equations, have AUCs in the range of 74.0–79.7 across the four outcomes (i.e., planned and unplanned attempts in both developed and developing countries; Table 6). This means that a randomly selected suicide attempter could be distinguished from a randomly selected non-attempter with 74.0–79.7% accuracy based on their comparative scores on these risk indices—demonstrating a relatively high level of precision. The two indices for planned attempts are consistent across countries in that roughly half of planned attempts (sensitivity: 45.4–51.3%) were made by the roughly one-third to one-fourth of respondents classified as having the highest risk in both developed and developing countries (22.1–31.2%), while fewer than 10% of planned attempts were made by the roughly one-third to one-fourth of respondents classified as having low 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
