1. Non–Small Cell Lung Cancer at the Extremes of Age: Impact on Diagnosis and Treatment 
William C Nugent, MD, Mark T Edney, BA, Paul G Hammerness, BA, Bradley J Dain, PhD, L.Herbert Maurer, MD, James R Rigas, MD 
The Annals of Thoracic Surgery 
Volume 63, Issue 1, Pages (January 1997)
DOI: /S (96)00745-X

2. Fig. 1
Kaplan-Meier survival curves for 47 young patients (solid line) and 81 older patients (dashed line) with non–small cell lung cancer (p < 0.05 by log-rank test).
The Annals of Thoracic Surgery  , DOI: ( /S (96)00745-X)