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J Asthma. 2014 Oct;51(8):839-46. doi: 10.3109/02770903.2014.922190. Epub 2014 May 29.

Hyperventilation in asthma: a validation study of the Nijmegen Questionnaire--NQ.

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1
Department of Physical Therapy, Technological and Educational Institution - TEI of Athens , Athens , Greece .

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.

KEYWORDS:

Hyperventilation; Nijmegen questionnaire; reliability; validity

PMID:
24823322
DOI:
10.3109/02770903.2014.922190
[Indexed for MEDLINE]
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