Statistical Analysis
Data with normal distribution were presented as mean (standard deviation); whereas, those not normally distributed were presented as median (interquartile range). Categorical data were presented as frequencies (percentages). Differences in demographic characteristics and pregnancy outcomes between the FEV1% predicted ≥ 65 and FEV1% predicted < 65 groups were assessed by chi‐square test or Fisher’s exact test for categorical variables, and t‐test for continuous covariates or the Mann‐Whitney U‐test for covariates not normally distributed. Given the small number of fetal deaths, a multivariable penalized logistic regression was used to estimate adjusted odds ratios with 95% confidence intervals. For the same reason, only a small number of covariates were used in the model. A p value of less than 0.05 was considered statistically significant. IBM SPSS version 25 for Windows was used for statistical analysis.