Table 3.

Modified National Heart Lung Blood Institute asthma control level classification guide (given by National Heart Lung Blood Institute).

Component of control		Age in years	Level of asthma control
			Well controlled	Not well controlled	Very poorly controlled
Impairment
	Symptoms	0-11	≤2 days/week but ≤1 time a day	>2 days/week or multiple times on ≤2 days/week	Throughout the day
		≥12	≤2 days/week	>2 days/week	Throughout the day
	Nighttime awakenings	0-4	≤1 time a month	>1 time a month	>1 time a week
		5-11	≤1 time a month	≥2 times a month	≥2 times a week
		≥12	≤2 times a month	1-3 times a week	≥4 times a week
	Interference with normal activity	All	None	Some limitation	Extremely limited
	Rescue medication; use for symptoms	All	≤2 days/week	>2 days/week	Several times per day