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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Gastrointest Endosc. 2019 Apr 30;90(3):360–369. doi: 10.1016/j.gie.2019.04.236

FIGURE 2. Checklist for Implementing and Diagnosing Propensity Score (PS) Methods.

FIGURE 2.

Note: the standardized mean difference (SMD) is calculated as the difference between two means or proportions, divided by the pooled standard deviation. The SMD is advantageous over the p-value in that it quantifies the degree of imbalance and is not sensitive to sample size.