| Title |
Dietary vitamin C intake protects against COPD: the Korea National Health and Nutrition Examination Survey in 2012
|
|---|---|
| Published in |
International Journal of Chronic Obstructive Pulmonary Disease, October 2016
|
| DOI | 10.2147/copd.s119448 |
| Pubmed ID | |
| Authors |
Hye Jung Park, Min Kwang Byun, Hyung Jung Kim, Jae Yeol Kim, Yu-Il Kim, Kwang-Ha Yoo, Eun Mi Chun, Ji Ye Jung, Sang Haak Lee, Chul Min Ahn |
| Abstract |
Vitamin C, as an antioxidant, has recently been suggested to provide protection against COPD; however, only few national cohort studies have investigated these effects. We aimed to confirm the protective effects of vitamin C against COPD in Korean patients. We analyzed the data of 3,283 adults aged ≥40 years (representing 23,541,704 subjects) who underwent pulmonary function tests and responded to questionnaires on smoking history and vitamin C intake, with stratification variables and sampling weight designated by the Korea 2012 National Health and Nutrition Examination Survey. Among all the subjects, 512 (representing 3,459,679 subjects; 15.6%) were diagnosed as having COPD based on pulmonary function test results. Male gender, old age, residence in suburban/rural regions, low household income, low educational level, an occupation in agriculture or fisheries, and heavy smoking were significantly associated with COPD. Low intake of nutrients, including potassium, vitamin A, carotene, retinol, and vitamin C, was significantly associated with COPD. The prevalence of COPD in heavy smokers with the lowest quartile (Q1, <48.50 mg; 63.0%) and low-middle quartile (Q2, 48.50-84.38 mg; 56.4%) of vitamin C intake was significantly higher than that in subjects with the high-middle quartile (Q3, 84.38-141.63 mg; 29.5%) and highest quartile (Q4, >141.63 mg; 32.6%) of vitamin C intake (P=0.015). In multivariate analysis, male gender, old age, heavy smoking, and a low intake of vitamin C were significant independent risk factors for COPD. A significant reduction of 76.7% in COPD risk was observed with a Q3 vitamin C intake compared to Q1 vitamin C intake (odds ratio, 0.233; 95% confidence interval, 0.094-0.576) in heavy smokers. This large-scale national study suggests that dietary vitamin C provides protection against COPD, independent of smoking history, in the general Korean population. |
X Demographics
The data shown below were collected from the profiles of 13 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 5 | 38% |
| Kuwait | 1 | 8% |
| Canada | 1 | 8% |
| Netherlands | 1 | 8% |
| Spain | 1 | 8% |
| Trinidad and Tobago | 1 | 8% |
| Ireland | 1 | 8% |
| Unknown | 2 | 15% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 10 | 77% |
| Practitioners (doctors, other healthcare professionals) | 2 | 15% |
| Scientists | 1 | 8% |
Mendeley readers
The data shown below were compiled from readership statistics for 60 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 60 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 9 | 15% |
| Researcher | 9 | 15% |
| Student > Bachelor | 8 | 13% |
| Other | 4 | 7% |
| Professor | 3 | 5% |
| Other | 7 | 12% |
| Unknown | 20 | 33% |
| Readers by discipline | Count | As % |
|---|---|---|
| Medicine and Dentistry | 20 | 33% |
| Nursing and Health Professions | 10 | 17% |
| Pharmacology, Toxicology and Pharmaceutical Science | 2 | 3% |
| Agricultural and Biological Sciences | 2 | 3% |
| Environmental Science | 1 | 2% |
| Other | 4 | 7% |
| Unknown | 21 | 35% |
Attention Score in Context
This research output has an Altmetric Attention Score of 30. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 February 2024.
All research outputs
#1,326,799
of 25,576,275 outputs
Outputs from International Journal of Chronic Obstructive Pulmonary Disease
#64
of 2,585 outputs
Outputs of similar age
#23,880
of 333,154 outputs
Outputs of similar age from International Journal of Chronic Obstructive Pulmonary Disease
#4
of 96 outputs
Altmetric has tracked 25,576,275 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 94th percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 2,585 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.5. This one has done particularly well, scoring higher than 97% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 333,154 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 92% of its contemporaries.
We're also able to compare this research output to 96 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 96% of its contemporaries.