From: Rib fracture after stereotactic radiotherapy on follow-up thin-section computed tomography in 177 primary lung cancer patients
Tumor-chest wall distance(mm)
Crude frequency
Frequency at 24 months by Kaplan-Meier method
≤25
41/148(27.8%)
33.2%
≤16
30/131(31.3%)
37.1%
0
22/60(36.7%)
51.8%