Table 3. Validity of the Primary care Screening Questionnaire for Depression (PSQ4D) in different subgroups.
| Subgroup | Sensitivity % (95% CI) | Specificity % (95% CI) | Positive predictive value % (95% CI) | Negative predictive value % (95% CI) | Accuracy % (95% CI) |
|---|---|---|---|---|---|
| Whole sample (n=827) | 96 (94.6–97.4) | 87 (83.6–90.4) | 73.5 (72.0–75.0) | 98.3 (97.7–98.9) | 90 (89–91) |
| Women (n=491) | 95.3 (93.4–97.2) | 85.7 (82.5–88.9) | 77.9 (77.5–78.3) | 97.1 (96.3–97.9) | 89 (87.6–90.4) |
| Men (n=336) | 98.2 (97–99.4) | 88.6 (87.1–90.3) | 62.8 (60.2–65.4) | 99.6 (99.3–99.9) | 90 (88.4–91.6) |
| Age 18–40 years (n=504) | 91.2 (88.7–93.5) | 90.5 (89.2–91.8) | 73.1 (71.2–75.0) | 96.5 (95.7–97.3) | 90 (88.7–91.3) |
| Age 41–60 years (n=323) | 94.9 (93.7–96.1) | 80.4 (78.2–82.6) | 73.6 (71.1–76.1) | 82 (79.9–84.1) | 86 (84.1–87.9) |
| Public hospitals (n=552) | 95.3 (93.5–97.1) | 81.4 (79.7–83.1) | 73.2 (71.3–75.1) | 97 (96.3–97.7) | 86 (85.8–86.2) |
| Private hospitals (n=275) | 100 | 95.5 (94.2–96.8) | 75 (72.4–77.6) | 100 | 96 (94.8–97.2) |