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BC Cohort Disease Free Survival by Standardized IHC PgR: Assay results are categorized by their z-scores (greater to or equal to 1 standard deviation (SD) below mean, less than 1 SD below the mean, less than or equal to 1 SD above the mean, and greater than 1 SD above the mean). P-value is that for the generalized Wilcoxon (Peto-Prentice) test statistic. IHC, immunohistochemistry; PgR, progesterone receptor.
