Table 5

Age-stratified comparison of database indexes of asthma severity and control and FEV₁ measures

	Variable	N	Mean	p Value
FEV₁, forced expiratory volume in 1 s.
*Moderate vs mild asthma.
†Severe vs mild asthma.
‡Severe vs moderate asthma.
Asthma severity
⩽45 years (N = 34)
Mild	FEV₁ predicted %	20	95.2
Moderate	FEV₁ predicted %	9	68.7	0.002*
Severe	FEV₁ predicted %	5	61.1	0.002†
				0.519‡
>45 years (N = 37)
Mild	FEV₁ predicted %	15	82.6
Moderate	FEV₁ predicted %	12	78.1	0.552*
Severe	FEV₁ predicted %	10	61.6	0.026†
				0.015‡

Asthma control
⩽45 years (N = 34)
Controlled	FEV₁ predicted %	21	92.0
Uncontrolled	FEV₁ predicted %	13	68.9	0.004

>45 years (N = 37)
Controlled	FEV₁ predicted %	17	86.4
Uncontrolled	FEV₁ predicted %	20	66.2	0.004