A most stubborn bias: No adjustment method fully resolves confounding by indication in observational studies

. Author manuscript; available in PMC: 2011 Jan 1.

Published in final edited form as: J Clin Epidemiol. 2009 May 19;63(1):64–74. doi: 10.1016/j.jclinepi.2009.03.001

Figure 2. Propensity score distribution for adjuvant chemotherapy in older women with breast cancer by quintile. The propensity score analytic sample trimmed the “All exposed” and “All unexposed” categories.