Correlations between oxidative balance score and female asthma among U.S. adults.

In order to explore the association of oxidative balance score (OBS) with female asthma among U.S. adults, we applied multiple logistic regression models, restricted cubic spline, and subgroup analysis using a cross-sectional study from the National Health and Nutrition Examination Survey (NHANES). 17,582 female out of the 91,351 participants from 2001 to 2018 in NHANES were enrolled in the analysis and 2,795 female participants had asthma. In three models, the OBS was negatively associated with female asthma incidence with the odds ratios (OR) = 0.99. When comparing the ratio of Q2, Q3, and Q4 of OBS quartiles against the Q1 quartile, the adjusted OR with 95% confidence intervals (95%CI) were 0.88 (0.75-1.03), 0.84 (0.73-0.97), and 0.82 (0.70-0.96) respectively, with p < 0.01 in the all covariates adjusted models. The restricted cubic splines indicated a linear relationship between OBS and female asthma. Subgroup analysis revealed no significant interaction effects except in the smoke group (p < 0.001), and there was a significant difference in the former smoker with OR 0.97 (0.96-0.99). We observed that there is negative relationship between OBS score and female asthma incidence, which suggests OBS probably is a protective factor for female on-set asthma. According to the subgroup analysis, smoking should be recommended to reduce asthma morbidity.