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.