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Coffee consumption was associated with significantly reduced incidence of radiographic knee osteoarthritis in women: a cross-sectional study using the Fifth Korea National Health and Nutrition Examination Survey (KNHANES V-1, 2)
Author(s):
Kim J. (South Korea (ROK))
,
Kim J. (South Korea (ROK))
Affiliations:
Lim C.
,
Lim C.
Affiliations:
Han J.
,
Han J.
Affiliations:
Lee S.
,
Lee S.
Affiliations:
Bae J.
,
Bae J.
Affiliations:
Park J.
Park J.
Affiliations:
ESSKA Academy. Kim J. May 9, 2018; 209333; P03-976 Topic: Knee
Prof. Jae Gyoon Kim
Prof. Jae Gyoon Kim
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Abstract
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Objectives: As various beverages consumption are increasing remarkably over the past decade in Korea, the health effects concerning the beverage drinking has gained a wide attention. Especially, coffee is one of the most widely consumed beverages in Korea. However, there was no study about the effect of beverages including coffee on knee osteoarthritis (OA). Therefore, this study aims to investigate the relationship between beverages (coffee, green tea, milk, soft drink), which are commonly encountered in daily living and the incidence of radiologic knee OA in Korean.

Methods: A cross-sectional study was performed using a publicly accessible datasets collected through Korean National Health and Nutrition Examination Survey (KNHANES-V1, 2). Among 17,476 individuals from two consecutive years' worth of data from 2010 to 2011, we limited our search to participants aged 50 years over. Then, we excluded participants who did not taken knee plain radiographs and who had undergone bilateral knee joint replacement, participants who did not complete surveys on dietary information. Finally, data from 5,503 (2,314 men and 3,189 women) subjects were examined. KHANES provide nine response choices reflecting the frequency of beverage consumption. We reclassified the nine responses into three categories according to drinking frequency as follows: never, monthly or weekly, daily. Radiographic knee OA were defined as those who had a Kellgren-Lawrence grade 2 or more. The relations of knee OA and beverages consumption were analyzed by chi-square test and multivariable logistic regression analysis after adjustment for confounders.

Results: In chi-square test, the radiographic knee OA was negatively associated with the coffee consumption in women (P=0.03), but not men. And, the radiographic knee OA was negatively associated with the consumption of green tea and milk in both sexes (green tea, men: P<0.001, women: P<0.001, milk, men: P=0.02, women: P<0.001). There was no significant association between radiographic knee OA and soft drink consumption. In regression analysis, we found that the women who at least monthly drink one cup of coffee exhibited 36% reduction in incidence of radiographic knee OA compared to the women who did not drink it (P-value=0.02, 95% CI=0.44-0.93). And, the women who daily drink coffee reduced the incidence of radiologic knee OA by 40% than the women who did not drink it (P-value=0.03, 95% CI=0.41-0.89). However, there was no significance in men. And, there were no significant associations between knee OA and consumption of green tea, milk, soft drink in regression analysis.

Conclusions: The findings of our study indicate that the frequency of coffee consumption had an negative association with the incidence of radiographic knee OA in Korean women. We also found that green tea and milk had significant relation with knee OA in both sexes, but no significant association in regression analysis after adjusting confounders.

Keywords:
Knee, Osteoarthritis, Coffee, Cross-sectional study
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