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. Author manuscript; available in PMC: 2018 Dec 10.
Published in final edited form as: Stata J. 2017 Mar;17(1):181–207.
                  _t Haz. Ratio Std. Err.  z P>|z| [95% Conf. Interval]

              score
Medium risk 1.271235 .1593392 1.91 0.056 .9943389 1.625238
    High risk 1.769899 .3219273 3.14 0.002 1.239148 2.52798