Table 6.
Performance of summary risk indices for 12-month suicide attempt
| I. Developed Countries | ||||||
| a. Attempts/Plan | ||||||
| PPV1(se) | Sens2(se) | Spec3(se) | OR4(95% CI) | (n)5 | ||
| 1 | 4.2 (1.8) | 4.5(1.8) | 49.5(4.2) | 1.0(1.0–1.0) | (98) | |
| 2 | 23.1 (10.1) | 4.9(2.3) | 7.8(2.5) | 7.4(1.8–30.8) | (22) | |
| 3 | 40.8 (5.0) | 45.2(6.1) | 31.8(3.4) | 17.1(6.6–44.7) | (134) | |
| 4 | 66.8 (7.1) | 45.4(6.4) | 10.9(2.3) | 55.5(18.9–163.3) | (73) | |
| Total | 32.6 (3.3) | 100.0(0.0) | 100.0(0.0) | χ24 = 54.5(<.001)* | (327)6 | |
| AUC 79.7 | ||||||
| b. Attempts/No Plan | ||||||
| PPV1(se) | Sens2(se) | Spec3(se) | OR4(95% CI) | (n)5 | ||
| 1 | 0.0 (0.0) | 0.0(0.0) | 12.6(1.5) | -(-- - --) | (93) | |
| 2 | 2.3 (0.8) | 12.2(4.2) | 44.8(2.4) | 1.0 (1.0–1.0) | (310) | |
| 3 | 12.5 (2.2) | 66.8(7.0) | 40.5(2.4) | 6.2 (2.8–13.8) | (303) | |
| 4 | 46.9 (9.4) | 21.0(6.3) | 2.1(0.5) | 40.1(13.9–115.7) | (31) | |
| Total | 8.0 (1.1) | 100.0(0.0) | 100.0(0.0) | χ24 = 48.1(<.001)* | (737)7 | |
| AUC 76.9 | ||||||
| II. Developing Countries | ||||||
| a. Attempts/Plan | ||||||
| PPV1(se) | Sens2(se) | Spec3(se) | OR4(95% CI) | (n)5 | ||
| 1 | 12.1 (3.3) | 7.9(2.2) | 41.0(3.7) | 1.0(1.0–1.0) | (114) | |
| 2 | 41.0 (4.3) | 40.8(4.5) | 42.2(3.6) | 4.6(2.2–9.7) | (177) | |
| 3 | 68.7 (5.0) | 51.3(4.8) | 16.8(2.7) | 16.4(7.6–35.4) | (123) | |
| Total | 41.8 (3.2) | 100.0(0.0) | 100.0(0.0) | χ24 = 52.7(<.001)* | (414)8 | |
| AUC 74.0 | ||||||
| b. Attempts/No Plan | ||||||
| PPV1(se) | Sens2(se) | Spec3(se) | OR4(95% CI) | (n)5 | ||
| 1 | 4.0 (1.0) | 29.8(6.9) | 70.5(2.0) | 1.0(1.0–1.0) | (523) | |
| 2 | 8.4 (2.1) | 20.3(5.3) | 21.7(1.9) | 1.9(0.9–4.2) | (179) | |
| 3 | 38.5 (7.9) | 49.9(8.6) | 7.9(1.2) | 18.8(8.4–42.1) | (81) | |
| Total | 9.0 (1.4) | 100.0(0.0) | 100.0(0.0) | χ24 = 53.9(<.001)* | (783)9 | |
| AUC 74.9 | ||||||
*
Significance at 0.05 level
1
Percent with attempts among each row category
2
Sensitivity: out of those that had an attempt, % of each row category
3
Specificity: out of those that did not have an attempt, % of each row category
4
Significance tests control for countries, predicting 12-mo attempt with categorical risk factor levels.
5
Number of cases in each row category
6
Among ideators with a plan in developed countries
7
Among ideators without a plan in developed countries
8
Among ideators with a plan in developing countries
9
Among ideators without a plan in developing countries