Table 5

Probability of therapy resistant asthma (TRA) when different prognostic factors were present at presentation

Inhaled steroid >2000 μg BDP equivalentPresenting FEV1 <70% predictedPrevious specialist referralProbability of TRA
✓=variable present; ×=variable absent.
×××0.08
××✓0.27
×✓×0.29
✓××0.44
×✓✓0.62
✓×✓0.76
✓✓×0.78
✓✓✓0.93