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In this study, the cross-calibration of a fan beam DXA system (Hologic QDR-2000) to a pencil beam scanner from the same manufacturer (Hologic QDR-1000/W) is described. The scanners were calibrated by the manufacturer using the same anthropomorphic spine phantom at installation. To verify consistent machine calibration, a group of 69 female subjects, aged(More)
A concept for quality assurance (QA) in bone densitometry has been developed for clinical multicenter studies. Major elements provided by a coordinating center comprise (1) consulting services and certification of participating centers in the start-up phase of the study, (2) review of scan data acquired on QA standards for cross-calibration and longitudinal(More)
OBJECTIVE To evaluate an all-volunteer syringe exchange program in San Francisco, Calif. DATA SOURCES Syringe exchange program records and 11 semiannual surveys administered during a 5.5-year period, using standard questionnaires. Interviews (N = 5644) were conducted with injection drug users recruited in two 21-day drug detoxification clinics and three(More)
BACKGROUND AND OBJECTIVES To identify relationships between sexual behavior, drug use, and HIV infection among female injection-drug users (IDUs) recruited in community settings. STUDY DESIGN Risk analysis of 407 survey questionnaires and matched HIV serologies (n = 403) from female IDUs recruited from community settings in 3 inner-city neighborhoods in(More)
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