Table 3.
Operating Characteristics of Geriatric Depression Scale Cut scores with Respect to Patient Suicide Ideation Status, by Sex
| GDS Cut score | Total Sample
|
Men
|
Women
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sensitivity* | Specificity | PPV | NPV | Sensitivity‡ | Specificity | PPV | NPV | Sensitivity|| | Specificity | PPV | NPV | |
| 2 | 0.884 | 0.557 | 0.198 | 0.975 | 0.900 | 0.586 | 0.168 | 0.984 | 0.878 | 0.538 | 0.214 | 0.968 |
| 3 | 0.797 | 0.722 | 0.262 | 0.966 | 0.900 | 0.753 | 0.254 | 0.988 | 0.755 | 0.702 | 0.266 | 0.952 |
| 4 | 0.754 | 0.815 | 0.335 | 0.964 | 0.850 | 0.833 | 0.321 | 0.984 | 0.714 | 0.804 | 0.343 | 0.952 |
| 5 | 0.652 | 0.878 | 0.398 | 0.953 | 0.850 | 0.916 | 0.486 | 0.985 | 0.571 | 0.854 | 0.359 | 0.933 |
| 6 | 0.551 | 0.910 | 0.432 | 0.942 | 0.650 | 0.940 | 0.500 | 0.967 | 0.510 | 0.892 | 0.403 | 0.927 |
| GDS-SI Cut score | Sensitivity† | Specificity | PPV | NPV | Sensitivity§ | Specificity | PPV | NPV | Sensitivity¶ | Specificity | PPV | NPV |
|
| ||||||||||||
| 1 | 0.797 | 0.804 | 0.335 | 0.970 | 0.800 | 0.809 | 0.281 | 0.978 | 0.796 | 0.801 | 0.364 | 0.965 |
| 2 | 0.551 | 0.928 | 0.487 | 0.943 | 0.650 | 0.949 | 0.542 | 0.967 | 0.510 | 0.915 | 0.463 | 0.929 |
| 3 | 0.348 | 0.978 | 0.667 | 0.924 | 0.500 | 0.986 | 0.813 | 0.968 | 0.286 | 0.974 | 0.609 | 0.905 |
Bold numbers reflect suggested cut scores. We tested the significance of the receiver operating characteristic curves by computing the area under the curves produced by plotting sensitivity against 1 minus specificity, for suicide ideators (N = 69; 20 men and 49 women) vs non ideators (N = 557; 215 men and 342 women); AUCs were compared against a null hypothesis of 50% coverage using a Wilcoxon rank sum test.
Area under the curve (AUC), 0.844; standard error, 0.026; 95% CI, 0.793–0.896.
AUC, 0.834; standard error, 0.031; 95% CI, 0.774 – 0.894.
AUC, 0.902; standard error, 0.047; 95% CI, 0.810 – 0.994.
AUC, 0.857; standard error, 0.057; 95% CI, 0.745– 0.969.
AUC, 0.814; standard error, 0.032; 95% CI, 0.752 – 0.877.
AUC, 0.822; standard error, 0.036; 95% CI, 0.751– 0.893.
PPV, positive predictive value; NPV, negative predictive value; GDS, Geriatric Depression Scale (α = 0.81 total; α = 0.82 for men and α = 0.80 for women); GDS-SI, 5-item Geriatric Depression Scale-Suicide Ideation screen (α = 0.68 total; α = 0.73 for men and α = 0.65 for women).