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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: Pharmacoepidemiol Drug Saf. 2013 Jan 7;22(8):10.1002/pds.3386. doi: 10.1002/pds.3386

Figure 3. Comparison of covariate balance between full (unmatched) population and matched cohorts generated by the conventional and CTS PS from April 2003 through May 2006.

Figure 3

CTS=Calendar Time-Specific; Time periods are May through April of the years noted. ◆ =Mean; Center line=median; Bottom/Top of box=25th / 75th percentile; Bottom/Top lines=Minimum/Maximum;

Time periods are May through April of the years noted.

*Balance measured by absolute difference in percentage between exposed and unexposed within covariate level for each time period.