Dietary fat and the prevalence of hand osteoarthritis: data from the osteoarthritis initiative
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OBJECTIVE: To determine the effect of total dietary fat intake on the prevalence of hand osteoarthritis (HOA) utilizing data collected in the Osteoarthritis Initiative (OAI) study cohort. METHODS: This is an observational cross-sectional study. Subjects from the OAI cohort with hand radiographs were analyzed for HOA, defined as a Kellgren-Lawrence score of ≥2 in two or more joints on different fingers. Dietary data and socioeconomic factors were collected from the baseline study visit. Logistic regression analysis assessed the association of total fat intake and disease prevalence. Odds ratios were calculated from the coefficients and confidence intervals were calculated with log-likelihood. RESULTS: HOA was prevalent in 1,106 out of the 2,993 participants (37%). Total fat intake did not show a significant relationship to disease prevalence when adjusted for age, education, income, race, smoking, BMI, prescription NSAID use, calcium intake, protein intake, total calories, saturated/monounsaturated fats, and alcohol consumption. There was a significant association of HOA with age, sex, education, race, total calories, and alcohol intake. Sex was analyzed independently to assess for effect modification, showing an association with age (P<0.01) OR (95%CI) 1.03 (1.02,1.03), race (P<0.01) 1.16 (1.09,1.23), and alcohol consumption (P<0.01) 1.06 (1.02,1.09) among only female subjects. Male subjects showed a strong association with age (P<0.01) 1.02 (1.01,1.02). CONCLUSION: Total fat intake does not show a significant association with HOA prevalence with the study sample from the OAI cohort. Age, race, and alcohol consumption showed significant associations depending on sex. More research is needed to further investigation these associations among different groups.