Exploration in association between vitamin D, sleep quality, and osteoarthritis: A modeling study

Previous studies on the relationship between vitamin D, sleep quality, and osteoarthritis (OA) have been controversial and the aim of this study is to analyze the association. In this study, relevant data from 2 survey cycles (2009-2010 with 2011-2012) are downloaded from the CDC's NHANES project to analyze the relationship between vitamin D, sleep quality, and osteoarthritis, as well as other related risk factors. The analysis of statistics in this study is performed using t-tests and chi-square tests, modeling is performed using logistic regression based on NHANES weights, and other risk factors are analyzed using forest plots. In association models between serum vitamin D, sleep quality, and OA is statistically significant during the stepwise inclusion of covariates. In model 1, Q3 (OR = 1.83; 95% CI: 1.05, 3.23) and Q4 (OR = 2.22; 95% CI: 1.27, 3.94) are significant. Neither model 2 nor model 3 is statistically significant and P for trend is more than .05 in all 3 models. After the inclusion of all covariates, forest plot showed that sleep deprivation (OR = 1.64; 95% CI: 1.05, 2.56), advanced age (OR = 1.03; 95% CI: 1.01, 1.04), female (OR = 1.79; 95% CI: 1.14, 2.85), overweight (25 ≤ BMI < 30) (OR = 1.92; 95% CI: 1.05, 3.61), and obesity (≥30) (OR = 2.06; 95% CI: 1.11, 3.93) are risk factors for OA. This study is based on a larger sample and a stepwise logistic regression of multiple covariates. We concluded that vitamin D may not influence OA. However other risk factors for OA are confirmed, including advanced age, female and high BMI, especially bad sleep quality.