Table 4 .
Agreement based on valid measuresa
| Asymptomatic cases | |||
|---|---|---|---|
| LAB −ve | LAB +ve | Total | |
| POCKIT negative | 222 | 1 | 223 |
| POCKIT positive | 3 | 5 | 8 |
| Total | 225 | 6 | 231 |
| Test attributes | (95% CIs) | ||
| Prevalence (LAB measure) | 2.6% | (0.96––5.57%) | |
| Positive agreement (LAB positive as denom) | 83.3% | (35.9–99.6%) | |
| Negative agreement (LAB negative as denom) | 98.7% | (96.2–99.7%) | |
| Kappa | 0.706 | (0.429–0.982) | |
| PABAK | 0.965 | (0.932–0.999) | |
| Symptomatic cases | |||
| LAB −ve | LAB +ve | Total | |
| POCKIT negative | 24 | 0 | 24 |
| POCKIT positive | 0 | 1 | 1 |
| Total | 24 | 1 | 25 |
| Test attributes | (95% CIs) | ||
| Prevalence (LAB measure) | 4% | (1–20.4%) | |
| Positive agreement (LAB positive as denom) | 100% | (2.5–100%) | |
| Negative agreement (LAB negative as denom) | 100% | (85.8–100%) | |
| Kappa | 1 | (1–1) | |
| PABAK | 1 | (1–1) | |
aAll CIs are based on standard Stata commands: For Sensitivity, Specificity, PPV and NPV (except with the prevalence option), exact binomial CIs are given, (command ci). ROC area (Receiver Operating Characteristic) uses roctab. LR+ and LR- (based on risk ratio) and odds ratio all use command cs.