Table 6– Responsiveness of the Asthma Control Questionnaire (ACQ) and the shortened versions
QuestionnaireChange in score between clinic visits: stable patients (A)Change in score between clinic visits: unstable patients (B)A versus BResponsiveness index
ACQ all questions−0.20±0.760.29−0.93±1.450.0260.74±1.130.0720.455
Symptoms alone−0.26±0.900.24−1.24±1.510.0070.98±1.210.0270.544
Symptoms plus FEV1 % pred−0.28±0.800.16−1.09±1.450.0110.81±1.140.0510.540
Symptoms plus SABA use−0.17±0.850.42−1.03±1.500.0180.87±1.180.0450.450
  • FEV1: forced expiratory volume in 1 s; % pred: % predicted; SABA: short-acting β2-agonist.