Table 4 Comparison of database indexes of asthma severity and control against lung function measures.

	Variable	N	Mean	p Value
Asthma severity (N = 71)
Mild	FEV1 predicted %	35	89.8
Moderate	FEV1 predicted %	21	74.1	0.007*
Severe	FEV1 predicted %	15	61.5	<0.001†
				0.033‡
N = 56
Mild	FEV1/FVC	30	75.8
Moderate	FEV1/FVC	18	68.1	0.006*
Severe	FEV1/FVC	8	61.8	0.030†
				0.205‡
Asthma control (N = 71)
Controlled	FEV1 predicted %	38	89.5
Uncontrolled	FEV1 predicted %	33	67.3	<0.001
N = 56
Controlled	FEV1/FVC	33	75.3
Uncontrolled	FEV1/FVC	23	65.7	0.001

FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity.

*Moderate vs mild asthma.

†Severe vs mild asthma.

‡Severe vs moderate asthma.