(Severe persistent ) This group of children has symptoms multiple times per day, have a decrease in their physical activity, and have frequent flare-ups. Nighttime symptoms occur frequently.
(Moderate persistent ) This group of children has symptoms every day, and may have actively levels affected by the flare-ups. Nighttime symptoms occur greater than one time a week.
(Mild persistent) This group of children has symptoms more than two times a week, but not daily, and may have activity levels affected by the flare-ups. Nighttime symptoms occur greater than two times a month, but no more than once per week.
(Intermittent persistent) This group of children has symptoms no more than two times a week, do not have problems in-between flare-ups, and only have short flare-ups from a few hours to a few days. Nighttime symptoms occur less than two times a month.