Table 2 The incidence of SSI by telephone call interview and clinician’s evaluation at different time-points
Telephone call time-point | D7 | D14 | D30 | Combined |
|---|---|---|---|---|
Total paired observations | 187 | 156 | 141 | 484 |
SSI diagnosed by clinical review (gold standard) | 14 | 11 | 0 | 25 |
SSI correctly detected by telephone interview | 11 | 7 | 0 | 18 |
Incorrect detection of SSI by telephone interview (false positive test) | 0 | 0 | 0 | 0 |
Sensitivity of phone call (95%CI) | 79% (49.2–95.3) | 64% (30.8–89.1) | N/A | 72%(50.2–87.9) |
Specificity of phone call (95%CI) | 100% (97.9–100) | 100% (97.5–100) | N/A | 100%(99.2–100) |
Positive Predictive Value (PPV) | 100% (71.5–100) | 100%(59–100) | N/A | 100%(81.5–100) |
Negative Predictive Value (NPV) | 98.3%(95.1–99.6) | 97.3%(93.3–99.3) | N/A | 95.9%(96.9–99.4) |