Correlation of 25-Hydroxy Vitamin D and Serum Lipid Profile amongst Asymptomatic Adults in Mumbai City: A Cross-sectional Study

Abstract

Introduction: Deficiency of 25-Hydroxy Vitamin D (25-OH Vitamin) is prevalent globally. Vitamin D and cholesterol metabolism are known to be linked with each other. Few International studies have attempted to relate low Vitamin D level and altered serum lipid levels. However, Indian studies are lacking, hence there is a need to conduct the studies in Indian population. Aim: To study the correlation of the serum Vitamin D level with lipid profile amongst asymptomatic Indian adults in a tertiary care hospital, Mumbai, India. Materials and Methods: This cross-sectional study was conducted in SevenHills Hospital, Mumbai, Maharashtra, India (tertiary care hospital), from December 2016 to August 2017. A total of 243 asymptomatic adults, visiting the wellness clinic for routine assessment of health status were randomly selected. Study participants were divided into two groups based on Vitamin D levels. Group A (n=139) with Vitamin D level <20 ng/mL, group B (n=104) with Vitamin D ≥20 ng/mL. Group B was further segregated into sub group B1 (n=60) with Vitamin D level ≥20 ng/mL to <30 ng/mL and sub group B2 (n=44) with Vitamin D level ≥30 ng/mL. Fasting blood samples were collected to measure levels of serum Vitamin D and lipid profile. The measured values of Vitamin D and serum lipids were statistically analysed for any significant relationship using Chi-square test and Unpaired t-test and Pearson’s correlation. Results: Mean age of the participants of group A was 39.94±11.59 years and group B was 47.78±11.53 years. The difference in gender distribution and average BMI of both groups was not statistically significant (p-value=0.8599 and p-value=0.4497, respectively). On comparison of group A and group B2, average High Density Lipoprotein Cholesterol (HDL-C) level was comparatively higher amongst group B2 (52.18±11.87 mg/dL vs 45.81±12.76 mg/dL; p-value=0.0038) and average Triglyceride (TG) level was higher amongst group A (104.58±70.35 mg/dL vs 129.38±64.34 mg/dL; p-value=0.0308). There was no statistically significant linear correlation found between lipid profile parameters and Vitamin D. Conclusion: In present study, no significant correlation between Vitamin D deficiency and serum lipid profile was found. However, a statistically significant difference was found in average levels of HDL-C and TG amongst adults with adequate Vitamin D and those with Vitamin D deficiency.