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Development and validation of the COugh Assessment Test (COAT)
Author(s) -
Koo HyeonKyoung,
Jeong Ina,
Kim JooHee,
Kim SungKyoung,
Shin JongWook,
Park So Young,
Rhee Chin Kook,
Choi Eun Young,
Moon JiYong,
Kim Yee Hyung,
Lee Hyun,
Kang Hye Seon,
Min Kyung Hoon,
Kim Jin Woo,
Kim Je Hyeong,
Lee Sang Haak,
Yoo Kwang Ha,
Kim Deog Kyeom,
Yoon Hyoung Kyu,
Kim DongGyu,
Kim Hui Jung,
Jung KiSuck,
Jang Seung Hun
Publication year - 2019
Publication title -
respirology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 85
eISSN - 1440-1843
pISSN - 1323-7799
DOI - 10.1111/resp.13462
Subject(s) - medicine , cohort , chronic cough , physical therapy , quality of life (healthcare) , asthma , nursing
Background and objective A cough‐specific quality‐of‐life questionnaire is recommended to assess the impact of cough; however, a simple instrument to quantify cough is required for everyday clinical practice. This study was aimed to develop a short patient‐completed questionnaire (COugh Assessment Test, COAT). Methods The COAT was developed and validated by comparison with the Korean version of Leicester Cough Questionnaire (K‐LCQ) and cough numeric rating scale (NRS, 0–10, 11‐point scale) for chronic cough patients. Results Item selection identified five items regarding cough frequency, daily activity, sleep disturbance, fatigue and cough hypersensitivity (0–4 scaling of items, 0–20 score range) through reliability test cohort ( n = 78). Test–retest reliability was strong (intra‐class correlation coefficient = 0.88). The final COAT was compared with K‐LCQ and cough NRS in a validation cohort ( n = 323). In Rasch analysis, COAT fitted well to a unidimensional model. Pearson correlations of COAT versus K‐LCQ (i) before treatment, (ii) after treatment; COAT versus cough NRS (iii) before treatment, (iv) after treatment; (v) delta‐COAT versus delta‐cough NRS, (vi) delta‐COAT versus delta‐K‐LCQ were (i) −0.71, (ii) −0.81, (iii) 0.69, (iv) 0.82, (v) −0.66 and (vi) 0.72, respectively. Conclusion The COAT is a useful, simple questionnaire for assessing and monitoring cough.