Table 2.
Estimated Frequency of TST and QFT Test Results among the U.S.-Born Population 6 Years of Age and Older
| TST 5 mm |
TST 10 mm |
TST 15 mm |
||||||
|---|---|---|---|---|---|---|---|---|
| + | − | + | − | + | − | Any TST | ||
| QFT 0.35 IU | + | 0.8 (0.5–1.3) | 2.0 (1.3–3.0) | 0.6 (0.3–1.0) | 2.2 (1.5–3.2) | 0.4 (0.2–0.8) | 2.4 (1.6–3.4) | 2.8 (2.0–3.9) |
| − | 2.5 (1.4–4.3) | 94.8 (92.6–96.3) | 0.8 (0.4–1.6) | 96.4 (95.0–97.4) | 0.3 (0.1–0.6) | 97.0 (95.7–97.9) | 97.2 (96.1–98.1) | |
| QFT 0.7 IU | + | 0.6 (0.4–1.0) | 1.2 (0.8–1.8) | 0.5 (0.3–0.8) | 1.3 (0.9–1.9) | 0.3 (1.3–2.5) | 1.5 (1.1–2.1) | 1.8 (1.3–2.5) |
| − | 2.7 (1.6–4.5) | 95.6 (93.5–97.0) | 0.9 (0.5–1.8) | 97.3 (96.1–98.1) | 0.4 (0.2–0.8) | 97.9 (97.0–98.5) | 98.2 (97.5–98.7) | |
| QFT 1.0 IU | + | 0.6 (0.4–0.9) | 0.8 (0.5–1.3) | 0.5 (0.3–0.8) | 0.9 (0.6–1.4) | 0.3 (0.2–0.5) | 1.0 (0.7–1.5) | 1.4 (0.9–1.9) |
| − | 2.7 (1.6–4.6) | 95.9 (94.0–97.2) | 1.0 (0.5–1.8) | 97.7 (96.7–98.4) | 0.4 (0.2–0.8) | 98.3 (97.5–98.8) | 98.7 (98.1–99.1) | |
| Any QFT | 3.3 (2.0–5.4) | 96.7 (94.6–98.0) | 1.4 (0.8–2.5) | 98.6 (97.5–99.2) | 0.7 (0.4–1.2) | 99.3 (98.8–99.6) | ||
Definition of abbreviations: QFT = QuantiFERON-TB Gold In-Tube test; TST = tuberculin skin test.
Data are presented as percentages with 95% confidence intervals.