Table 4

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

	Variable	N	Mean	p Value
FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity.
*Moderate vs mild asthma.
†Severe vs mild asthma.
‡Severe vs moderate asthma.
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