True and false positive and negative diagnoses based on FEF50 cut off value of 26%
| True positive = ΔFEV1 of ⩾10% and a fall in FEF50 of ⩾26%. | |
| True negative = ΔFEV1 of ⩾10% and did not have a fall in FEF50 of ⩾26%. | |
| False positive = ΔFEV1 of ⩽10% and a fall in FEF50 of ⩾26%. | |
| False negative = ΔFEV1 of ⩾10% and a fall in FEF50 of ⩽26%. | |
| True positive | 39 |
| True negative | 55 |
| Total true | 94 |
| False negative | 21 |
| False positive | 1 |
| Total false | 22 |
| Total with EIA | 60 |
| Total without EIA | 56 |
| Total | 116 |