did not reach statistical significancep = 0.1148
No difference was seen between those with and without previous history of heart surgery (log-rank p = 0.6604), and although those with prior thoracotomy had worse median survival: 3.7 years (IQR:0.5-15.3) than those without: 6.8 years (0.8-20.5), this did not reach statistical significance (log-rank p = 0.1148).