Fig. 1

Forest plot of HR for all-cause death in PB patients. A total of 177 patients with malignant PB were stratified by different factors. HRs and 95% CIs for all-cause death in different stratifications were calculated using Cox models, with the first subgroup as reference. The p values were for the difference between subgroups in each stratification. All tests were 2-sided, and statistical significance was set as p-value of < 0.05. *, ** and *** indicated p<0.05, p<0.01 and p<0.001 respectively (R program, Version 3.6.3, R core team). PB, pulmonary blastoma; PPB, pleuropulmonary blastoma; WDFA, well-differentiated fetal adenocarcinoma; CBPB, classic biphasic PB; HR, hazard ratio; CI, confidence interval