TABLE 3

Comparison of Symptoms Days and Asthma Health Care Utilization

Baseline YearFollow-up YearChange
Mean days affected by asthma symptoms per yeara
    Control28.520.0−8.5
    Intervention30.214.6−15.6
Mean urgent asthma office visits per year
    Control1.670.77−0.90
    Intervention1.830.75−1.07
Mean ED asthma visits per yeara
    Control0.650.35−0.30
    Intervention0.860.31−0.55
Mean hospitalizations for asthma per year
    Control0.130.07−0.06
    Intervention0.120.06−0.06
  • a P < .05, after controlling for baseline values, patient age, patient gender, insurance type, asthma severity, and household smoking. The model also includes an interaction term for (group assignment) × (baseline value), with baseline values centered to its mean.