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Research
Jin-Shang Wu
Department of Family Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
Corresponding Author
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Background
Restrictive spirometry pattern (RSP) is found to be associated with an increased risk of all-cause and cardiovascular mortality. This study was aimed to examination of the association between tea consumption and RSP in smokers and non-smokers.
Methods
A total of 14,997 eligible subjects were analyzed after excluding individuals with (1) age <20 years, (2) a history of asthma, lung cancer, tuberculosis, or any chest structural deformities, or (3) a history of connective tissue diseases. RSP was defined as FVC<80% of the predicted value and an FEV1/FVC ratio ≥ 70%. One traditional Chinese teapot containing 120ml was defined as one “cup.” Habitual tea consumption was defined as 120mL/d or more for at least 1 year. To evaluate the effects of cumulative dosage of tea over time, the variable “cup-year” was obtained by multiplying the number of daily cups of tea by the number of years one has consumed.
Results
The amount of daily tea consumption and the prevalence of habitual tea drinking were significantly higher in the non-RSP group (65 ± 191 vs. 110 ± 242 mL, p < 0.001; 15.1% vs. 24.0%, p< 0.001). In multiple logistic regression, habitual tea drinker (OR = 0.75, CI 0.63-0.89, p < 0.01) and tea consumption no less than 3 cup-year (OR = 0.74, CI 0.61-0.89, p < 0.01) were associated with a lower risk of RSP in non-smoking group while the association was insignificant in the smoking group.
Conclusion
Habitual tea drinking and tea consumption of at least three cup-years were associated with a reduced risk of RSP in the non-smokers, but not in the smokers.
Keywords
restrictive spirometry pattern, tea, smoking
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A new preprint design is coming!
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research
Jin-Shang Wu
Department of Family Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 10 Dec, 2020
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Internal Medicine
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background
Restrictive spirometry pattern (RSP) is found to be associated with an increased risk of all-cause and cardiovascular mortality. This study was aimed to examination of the association between tea consumption and RSP in smokers and non-smokers.
Methods
A total of 14,997 eligible subjects were analyzed after excluding individuals with (1) age <20 years, (2) a history of asthma, lung cancer, tuberculosis, or any chest structural deformities, or (3) a history of connective tissue diseases. RSP was defined as FVC<80% of the predicted value and an FEV1/FVC ratio ≥ 70%. One traditional Chinese teapot containing 120ml was defined as one “cup.” Habitual tea consumption was defined as 120mL/d or more for at least 1 year. To evaluate the effects of cumulative dosage of tea over time, the variable “cup-year” was obtained by multiplying the number of daily cups of tea by the number of years one has consumed.
Results
The amount of daily tea consumption and the prevalence of habitual tea drinking were significantly higher in the non-RSP group (65 ± 191 vs. 110 ± 242 mL, p < 0.001; 15.1% vs. 24.0%, p< 0.001). In multiple logistic regression, habitual tea drinker (OR = 0.75, CI 0.63-0.89, p < 0.01) and tea consumption no less than 3 cup-year (OR = 0.74, CI 0.61-0.89, p < 0.01) were associated with a lower risk of RSP in non-smoking group while the association was insignificant in the smoking group.
Conclusion
Habitual tea drinking and tea consumption of at least three cup-years were associated with a reduced risk of RSP in the non-smokers, but not in the smokers.
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