نبذة مختصرة : OBJECTIVE: To investigate mammography facilities' follow-up times, population vulnerability, system-based processes, and association with cancer stage at diagnosis.DATA SOURCES: Prospectively collected from San Francisco Mammography Registry (SFMR) 2005-2011, California Cancer Registry 2005-2012, SFMR facility survey 2012.STUDY DESIGN: We examined time to biopsy for 17 750 abnormal mammogram results (BI-RADS 4/5), categorizing eight facilities as short or long follow-up based on proportion of mammograms with biopsy at 30 days. We examined facility population vulnerability (race/ethnicity, language, education), and system processes. Among women with a cancer diagnosis, we modeled odds of advanced-stage (≥IIb) cancer diagnosis by facility follow-up group.DATA EXTRACTION METHODS: Merged SFMR, Cancer Registry and facility survey data.PRINCIPAL FINDINGS: Facilities (N = 4) with short follow-up completed biopsies by 30 days for 82% of mammograms compared with 62% for facilities with long follow-up (N = 4) (P
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