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The survivor function predicted from the Cox proportional hazards model estimated from the study observations. The survivor function estimate was applied to urinary hCG measurements of 0, 50, 100, 250, 500, 750, 1000, or 2000 fmol/mg Cr at weeks 0, 56, 74, 77, and 137. Increasing urinary hCG measurements are associated with a decreasing survivor function.
