WANG Qinqin 1,2 , ZHANG Qiao 3 , LI Hong 1,2 , LIU Lingjun 1,2 , LAN Yi 1,2 , MA Qianli 1,2,3
  • 1. Department of Allergy and Immunology, Chongqing Songshan Hospital, Chongqing 401120, P.R. China;
  • 2. Chronic Respiratory Disease Management and Rehabilitation Center, Chongqing Songshan Hospital, Chongqing 401120, P.R.China;
  • 3. Department of Respiratory and Critical Care Medicine, Chongqing Songshan Hospital, Chongqing 401120, P.R.China;
MA Qianli, Email: cqmql@163.com
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Objective  To evaluate the applicability of the cut-off points of different versions of the Asthma Control Questionnaire (ACQ) in the Chinese population and their consistency with the symptom control criteria of the Global Initiative for Asthma (GINA), so as to provide strategies for cut-off point selection in clinical practice. Methods  Based on baseline data from a multicenter prospective cohort study, asthma patients who completed pulmonary function tests, GINA symptom control assessments, and the ACQ-7 questionnaire were included. Taking the GINA symptom control level as the gold standard, the Receiver Operating Characteristic Curve (ROC) was used to determine the optimal cut-off points of the ACQ for discriminating the GINA symptom control levels, and the consistency was analyzed by kappa statistics. Results  Among 399 patients (58.9% female; mean age 44.5 ± 12.8 years), asthma symptom control, partial control, and uncontrolled rates were 61.7%, 27.6%, and 10.8%, respectively. ROC analysis revealed the following optimal cutoffs for identifying symptom control: ACQ-5 (0.5), ACQ-6Res (0.42), ACQ-6PFT (0.92), and ACQ-7 (0.93); for identifying uncontrolled symptoms: ACQ-5 (0.9), ACQ-6Res (1.08), ACQ-6PFT (1.42), and ACQ-7 (1.36). All corresponding areas under the ROC curve (AUC) exceeded 0.9. Consistency between ACQ and GINA symptom control levels was moderate (Fleiss’ κ = 0.453–0.531). Performance characteristics varied between traditional (0.75/1.5) and optimized cutoffs. After optimization, ACQ-5 emerged as the only version achieving balanced sensitivity-specificity (Youden index = 0.75) in dual tasks: ACQ-5 ≤ 0.5 demonstrated sensitivity (91%) and specificity (84%) for symptom control, while ACQ-5 ≥ 0.9 showed sensitivity (95%) and specificity (80%) for uncontrolled status. Conclusions  Region-specific calibration of ACQ cutoffs enhances clinical utility in the Chinese population. A stratified application strategy is recommended: high-sensitivity cutoffs for initial screening to reduce underdiagnosis, high-specificity cutoffs for resource-constrained settings to minimize overtreatment, and optimized ACQ-5 cutoffs (≤0.5/≥0.9) for comprehensive management to balance sensitivity and specificity. Flexible combination of cutoff protocols tailored to screening objectives may optimize hierarchical asthma management.

Citation: WANG Qinqin, ZHANG Qiao, LI Hong, LIU Lingjun, LAN Yi, MA Qianli. Optimizing ACQ Cutoffs in Chinese Asthma Patients: Stratified Validation Against GINA Criteria. Chinese Journal of Respiratory and Critical Care Medicine, 2025, 24(8): 542-547. doi: 10.7507/1671-6205.202412130 Copy

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