Results of the 2 × 2 table and accuracy measures calculated after correction for verification bias
| . | Random glucose test . | . | . | . | 1-h 50-g glucose challenge test . | . | . | . | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | OGTT abnormal . | OGTT normal . | OGTT unverified . | Total . | OGTT abnormal . | OGTT normal . | OGTT unverified . | Total . | ||||||
| Screening test abnormal | 7 | 30 | 0 | 37 | 33 | 134 | 0 | 167 | ||||||
| Screening test normal | 41 | 1,223 | 0 | 1,264 | 14 | 1,100 | 0 | 1,114 | ||||||
| Total | 48 | 1,253 | 0 | 1,301 | 47 | 1,234 | 0 | 1,281 | ||||||
| . | Random glucose test . | . | . | . | 1-h 50-g glucose challenge test . | . | . | . | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| . | OGTT abnormal . | OGTT normal . | OGTT unverified . | Total . | OGTT abnormal . | OGTT normal . | OGTT unverified . | Total . | ||||||
| Screening test abnormal | 7 | 30 | 0 | 37 | 33 | 134 | 0 | 167 | ||||||
| Screening test normal | 41 | 1,223 | 0 | 1,264 | 14 | 1,100 | 0 | 1,114 | ||||||
| Total | 48 | 1,253 | 0 | 1,301 | 47 | 1,234 | 0 | 1,281 | ||||||
| Sensitivity (%) | 14.6 (4.6–24.6) | 70.2 (57.1–83.3) |
| Specificity (%) | 97.6 (96.6–98.5) | 89.1 (87.4–90.9) |
| Positive predictive value (%) | 18.9 (6.3–31.5) | 19.8 (3.7–25.8) |
| Negative predictive value (%) | 96.8 (91.0–100.0) | 98.7 (97.1–100.0) |
| Likelihood ratio for an abnormal test result | 6.1 (2.8–13.2) | 6.5 (5.1–8.3) |
| Likelihood ratio for a normal test result | 0.88 (0.78–0.98) | 0.33 (0.22–0.52) |
| Diagnostic odds ratio | 7.0 (2.9–16.8) | 19.4 (6.8–31.9) |
| Area under the curve | 0.69 (0.61–0.78) | 0.88 (0.83–0.93) |
| Sensitivity (%) | 14.6 (4.6–24.6) | 70.2 (57.1–83.3) |
| Specificity (%) | 97.6 (96.6–98.5) | 89.1 (87.4–90.9) |
| Positive predictive value (%) | 18.9 (6.3–31.5) | 19.8 (3.7–25.8) |
| Negative predictive value (%) | 96.8 (91.0–100.0) | 98.7 (97.1–100.0) |
| Likelihood ratio for an abnormal test result | 6.1 (2.8–13.2) | 6.5 (5.1–8.3) |
| Likelihood ratio for a normal test result | 0.88 (0.78–0.98) | 0.33 (0.22–0.52) |
| Diagnostic odds ratio | 7.0 (2.9–16.8) | 19.4 (6.8–31.9) |
| Area under the curve | 0.69 (0.61–0.78) | 0.88 (0.83–0.93) |
All accuracy measures are displayed with 95% CIs.