Clinical COPD Questionnaire

Abstract

The Clinical COPD Questionnaire (CCQ) is a concise, 10-item health questionnaire designed to measure the subjective health status and associated symptoms in patients diagnosed with obstructive airway diseases, primarily Chronic Obstructive Pulmonary Disease (COPD), emphysema, or Chronic bronchitis. Developed to be practical for clinical use, the CCQ provides a rapid assessment of the impact of the disease on a patient’s daily life, functional capacity, and emotional state. The scoring system is intuitive: higher scores reflect a poorer overall health status.

Keywords

Clinical COPD Questionnaire, CCQ, Chronic Obstructive Pulmonary Disease, COPD, Emphysema, Chronic bronchitis, Respiratory health, Health-related quality of life, Health status assessment.

Authors

van der Molen T, Willemse BW, Schokker S, Ten Hacken NH, Postma DS, Juniper EF (2003)

Purpose

The primary purpose of the CCQ is to provide a responsive, patient-reported outcome measure suitable for monitoring disease progression and evaluating the effectiveness of therapeutic interventions in individuals with COPD. Its brevity and ease of administration make it highly valuable for routine use in primary care and specialist clinics, where longer, more detailed questionnaires might be impractical.

The instrument is designed to capture the fluctuations in patient health across short timeframes, offering two distinct recall periods: a 24-hour version for acute changes and a weekly version for tracking more general trends in the patient’s condition related to lung diseases and the circulatory and respiratory system.

Construct

The CCQ measures the overall subjective disease burden, which is conceptualized as the patient’s perceived health status resulting from obstructive lung disease. This construct integrates several facets of health impact, rather than focusing on physiological measures alone. The 10 items inherently cover three core domains of human function as affected by COPD.

These domains include Symptoms (such as cough and breathlessness), Functional State (limitations in physical activities and daily life), and Mental State (emotional impact, including frustration or depression). Although the scale permits domain-specific analysis, it is most commonly used to generate a single total score reflecting the severity of the health impairment.

Validity

Although specific validity coefficients are not supplied in the source description, the Clinical COPD Questionnaire is well-established in respiratory psychometric literature. Studies typically confirm its strong construct validity by demonstrating high correlations with established, lengthier health-related quality of life instruments relevant to respiratory conditions, such as the St. George’s Respiratory Questionnaire (SGRQ).

The CCQ also exhibits robust discriminative validity, proving capable of distinguishing between patient groups based on known differences in disease severity, measured by factors like FEV1 (Forced Expiratory Volume in 1 second). Its ability to accurately reflect the negative impact of conditions like emphysema and Chronic bronchitis confirms its relevance for assessing clinical outcomes.

Reliability

The reliability of the CCQ ensures that it provides consistent measurement of the patient’s health status over time. The instrument demonstrates high internal consistency, meaning that all 10 items reliably measure the same underlying construct of COPD burden. This is generally supported by high Cronbach’s alpha values reported across various validation studies.

Furthermore, the scale possesses excellent test-retest reliability over short periods, confirming that scores remain stable when the patient’s underlying clinical condition is unchanged. This stability is essential for an instrument intended for longitudinal monitoring in clinical settings, ensuring that observed changes are genuine reflections of disease modification or treatment efficacy.

Factor Analysis

Factor analysis performed on the CCQ typically supports a multi-dimensional structure, aligning with the three primary domains it intends to cover: Symptoms, Functional State, and Mental State. Although the scale is brief, these factors are often recoverable through exploratory and confirmatory factor analysis, confirming the scale’s theoretical foundations.

Despite the presence of these distinct domains, the strong inter-correlation between the factors supports the common practice of calculating a single, global CCQ score. This overall score provides a highly sensitive measure of change, making it an excellent endpoint for clinical trials focused on the holistic impact of interventions for obstructive lung diseases.

Instrument

Test Type: Questionnaire (Self-report measure)

Format: 10 items, scored on a 7-point scale (0 to 6). Available in a 24-hour recall version and a weekly recall version.

Language Available: Original development in Dutch; widely translated and validated in numerous international languages.

Population Group: Patients diagnosed with Chronic Obstructive Pulmonary Disease (COPD), emphysema, or chronic bronchitis.

Age Group: Adults and Elderly individuals.

Population Details: Individuals presenting with chronic respiratory complaints, focusing on the functions of the Thorax/abdomen/organs, and assessment of activities, mental functions, sensory functions, and pain.

Test Methodology: Self-administered health status assessment via a 10-item questionnaire.

Keywords

Longitudinal monitoring, Psychometric instrument, Respiratory system, Lung function, Clinical trial endpoint, Functional status, Activities of daily living, Disease burden assessment.

Authors

Author ORCID Identifier: Not specified in source data.

Affiliation Email addresses: Not specified in source data.

Correspondence Address: Not specified in source data.

Permissions & Fee and Test Year

The Clinical COPD Questionnaire was developed and published in 2003 by van der Molen T. and colleagues. Users seeking to implement the CCQ in commercial clinical trials or for large-scale research should consult the primary author or the institution holding the copyright regarding necessary permissions and associated licensing fees. The scale is frequently utilized in non-commercial academic settings.

Reference’s

• van der Molen T, Willemse BW, Schokker S, Ten Hacken NH, Postma DS, Juniper EF. Development, validity and responsiveness of the Clinical COPD Questionnaire. Thorax. 2003;58(12):1023-1028.

Items of the Clinical COPD Questionnaire

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The original scale items are not provided directly in the source text. However, the measurement instrument and related documentation are available via the following PDF links:

• The original explanatory form (Toelichtingsformulier) can be downloaded here: https://scales.arabpsychology.com/wp-content/uploads/instrumenten/CCQ-form-1.pdf
• The 24-hour version of the measurement instrument can be downloaded here: https://scales.arabpsychology.com/wp-content/uploads/instrumenten/CCQ-meetinstr-24h.pdf
• The weekly version of the measurement instrument can be downloaded here: https://scales.arabpsychology.com/wp-content/uploads/instrumenten/CCQ-meetinstr-week.pdf