Acute severe asthma in emergency department: clinical characteristics, risk factors, and predictors for poor outcome

The Egyptian Journal of Bronchology

Table 5 Accuracy of PEFR in the prediction of severe asthma exacerbations among enrolled patients

	Sensitivity	Specificity	PPV	NPV	Accuracy	AUC	P-value
PEFR Baseline at cut-off point < 80	45	89	83	57	64.8	0.70	0.01*
PEFR After 1 h at cut-off point < 110	100	62	38	100	82.9	0.81	<0.001*
PEFR After 6 h at cut-off point < 260	65	88.2	85	71	75.5	0.72	<0.001*