Hyperventilation in asthma: A validation study of the Nijmegen Questionnaire - NQ.
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| Title: | Hyperventilation in asthma: A validation study of the Nijmegen Questionnaire - NQ. |
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| Authors: | Grammatopoulou, Eirini P. (AUTHOR), Skordilis, Emmanouil K. (AUTHOR), Georgoudis, Georgios (AUTHOR), Haniotou, Aikaterini (AUTHOR), Evangelodimou, Afroditi (AUTHOR), Fildissis, George (AUTHOR), Katsoulas, Theodoros (AUTHOR), Kalagiakos, Panagiotis (AUTHOR) |
| Source: | Journal of Asthma. Oct2014, Vol. 51 Issue 8, p839-846. 8p. 4 Charts, 1 Graph. |
| Subjects: | Hyperventilation, Asthma treatment, Hyperventilation syndrome, Asthmatics, Disease prevalence, Test reliability, Medical screening, Diagnosis |
| Abstract: | Introduction: The Nijmegen questionnaire (NQ) has previously been used for screening the hyperventilation syndrome (HVS) in asthmatics. However, no validity study has been reported so far. Objective: To examine the validity and reliability of the NQ in asthma patients and identify the prevalence of HVS. Methods: The NQ ( n = 162) was examined for translation, construct, cross-sectional and discriminant validity as well as for internal consistency and test-retest reliability. Results: Principal component analysis and exploratory factor analysis revealed a single factor solution with 11 items and 58.6% of explained variability. These 11 NQ items showed high internal consistency (Cronbach's alpha = 0.92) and test-retest reliability ( IR = 0.98). Higher NQ scores were found in the following subgroups: women versus men ( p < 0.01); participants with moderate versus mild asthma ( p < 0.001) or uncontrolled versus controlled asthma ( p < 0.001), and participants with breath-hold time (BHT) < 30 versus ≥ 30 s ( p < 0.01) or end-tidal CO2 (ETCO2) ≤35 versus >35 mmHg ( p < 0.001). A cut-off score of >17 discriminated the participants with regard to the presence of HVS. The NQ showed 92.73% sensitivity and 91.59% specificity. The total NQ score was found significantly correlated with ETCO2 ( r = −0.68), RR ( r = 0.66) and BHT ( r = −0.65). The prevalence of HVS was found 34%. Conclusion: The NQ is a valid and reliable questionnaire for screening HVS in patients with stable mild-to-moderate asthma. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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