High risk, n (%) | Sensitivity | Specificity | PPV | NPV | Accuracy | |
1-step (SQ only) | 269 (52) | 90.2 (82.2–95.4) | 55.8 (50.9–60.6) | 30.9 (28.2–33.6) | 96.3 (93.3–98.0) | 62.0 (57.6–66.2) |
2-step | 191 (37) | 78.3 (68.4–86.2) | 71.7 (67.2–76.0) | 37.7 (33.4–42.2) | 93.8 (91.1–95.7) | 72.9 (68.8–76.7) |
3-step | 124 (24) | 65.2 (54.6–74.9) | 84.8 (81.0–88.1) | 48.4 (41.7–55.1) | 91.8 (89.4–93.7) | 81.3 (77.6–84.6) |
NPV, negative predictive value; PPV, positive predictive value.