Why are summary statistics in the Fertility Clinic tables published by CDC different from summary statistics reported in the SART National Summary?
From 1996–2007, the percentage of ART clinics reporting data to CDC with a SART membership ranged from approximately 90% to 95%. Annual summary statistics of ART treatments performed in each of these clinics are available online at SART. Although the same table items are used in both the CDC’s Fertility Clinic Table and SART National Summary (except for one item—percentage of transferred embryos resulting in a successful implantation, which is not available in CDC’s table), discrepancies in tabulated statistics between the SART and CDC tables may be due to (1) the inclusion, in the CDC tables, of ART treatments performed at non-SART member clinics; (2) differences in the data submission deadlines between SART and CDC. Differences in submission dates may result in ART clinics being excluded from the CDC annual report but not from the SART National Summary report; and (3) differences in data processing procedures and statistical methods used to generate statistics.
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