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. 2023 Feb 22:14:1134621.
doi: 10.3389/fimmu.2023.1134621. eCollection 2023.

Association between serum folate levels and blood eosinophil counts in American adults with asthma: Results from NHANES 2011-2018

Jun Wen  1 , Changfen Wang  2 , Mohan Giri  1 , Shuliang Guo  1
Affiliations

Association between serum folate levels and blood eosinophil counts in American adults with asthma: Results from NHANES 2011-2018

Jun Wen et al. Front Immunol. .

Abstract

Background: To date, many researches have investigated the correlation of folate and asthma occurrence. Nevertheless, few studies have discussed whether folate status is correlated with dis-ease severity, control or progression of asthma. So, we explored the correlation of serum folate and blood eosinophil counts in asthmatic adults to gain the role of folate in the control, progression, and treatment of asthma.

Methods: Data were obtained from the 2011-2018 NHANES, in which serum folate, blood eosinophils, and other covariates were measured among 2332 asthmatic adults. The regression model, XGBoost algorithm model, and generalized linear model were used to explore the potential correlation. Moreover, we conducted stratified analyses to determine certain populations.

Results: Among three models, the multivariate regression analysis demonstrated serum folate levels were negatively correlated with blood eosinophil counts among asthmatic adults with statistical significance. And we observed that blood eosinophil counts decreased by 0.20 (-0.34, -0.06)/uL for each additional unit of serum folate (nmol/L) after adjusting for confounders. Moreover, we used the XGBoost Algorithm model to identify the relative significance of chosen variables correlated with blood eosinophil counts and observed the linear relationship between serum folate levels and blood eosinophil counts by constructing the generalized linear model.

Conclusions: Our study indicated that serum folate levels were inversely associated with blood eosinophil counts in asthmatic adult populations of America, which indicated serum folate might be correlated with the immune status of asthmatic adults in some way. We suggested that serum folate might affect the control, development, and treatment of asthma. Finally, we hope more people will recognize the role of folate in asthma.

Keywords: asthma; eosinophil; folate; machine learning; national health and nutrition examination survey.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Flowchart for selecting analyzed participants.
Figure 2
Figure 2
XGBoost model elucidates the relative significance of each variable on blood eosinophil counts and the corresponding variable significance score. The X-axis is the significance score, the relative number of a variable used to distribute the data; the Y-axis is the selected variables. PIR, poverty to income ratio; BAS, blood basophil counts; Vit, Vitamin.
Figure 3
Figure 3
Dose-response relationships of serum folate levels with blood eosinophil counts. The solid red line represents the smooth fitting curve between serum folate levels with blood eosinophil counts, and the blue dotted line represents the 95% CIs of the fitting.
See this image and copyright information in PMC

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