Data abstracted from patients’ recordsand submitted to the CDC include each patient’s demographiccharacteristics and medical history, as well as clinical informationon the procedures performed and resultant pregnancies and births.In 1996, 300 clinics reported more than 60,000 procedures; in1997, 335 clinics reported more than 70,000 procedures. Five to7 percent of clinics that were in operation during these years didnot report data, despite the federal requirement; because most ofthese were known to be small practices, we estimate that the datareported represent more than 95 percent of all procedures performed with the use of assisted reproductive technology.
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