Diagnostic accuracy of breath test (A) t50≥99.5 and (B) GEC≤3.03
| Delayed GE (breath test t50 ≥99.5) | Total | |||
| Normal GE | Delayed GE | |||
| (A) | ||||
| Delayed GE (retention at 180 min ≥13%) | Normal GE | 9 | 2 | 11 |
| Delayed GE | 1 | 11 | 12 | |
| Total | 10 | 13 | 23 | |
| Delayed GE (breath test GEC ≤3.03) | Total | |||
| Normal GE | Delayed GE | |||
| (B) | ||||
| Delayed GE (retention at 180 min ≥13%) | Normal GE | 7 | 2 | 9 |
| Delayed GE | 3 | 9 | 12 | |
| Total | 10 | 11 | 21 | |
(A) Sensitivity=0.917 (95% CI (0.681 to 0.995)); specificity=0.818 (95% CI (0.537 to 0.967)); positive predictive value=0.846 (95% CI (0.596 to 0.973)); negative predictive value=0.900 (95% CI (0.628 to 0.994)); positive likelihood ratio=5.04 (95% CI (1.42 to 17.87)); negative likelihood ratio=0.10 (95% CI (0.02 to 0.68)).
(B) Sensitivity=0.750 (95% CI (0.472 to 0.931)); specificity=0.778 (95% CI (0.458 to 0.959)); positive predictive value=0.818 (95% CI (0.537 to 0.967)); negative predictive value=0.700 (95% CI (0.393 to 0.915)); positive likelihood ratio= 3.38(95% CI (0.95 to 11.96)); negative likelihood ratio=0.32 (95% CI (0.11 to 0.91)).
GE, gastric emptying; GEC, gastric emptying coefficient; t50, half emptying time.