PEDIATRICS Vol. 91 No. 2 February 1993, pp. 445-450
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Epidemiology of Rett Syndrome: A Population-Based Registry

Claudia A. Kozinetz PhD, MPH1, Martha L. Skender MPH, RD1, Nancy MacNaughton MPH1, Mary Jane Almes MS1, Rebecca J. Schultz RN, MSN, CPNP1, Alan K. Percy MD1, and Daniel G. Glaze MD1

1 From The Rett Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX

The Texas Rett Syndrome Registry maintains the largest population-based registry of cases and potential cases of Rett syndrome in the world. The most precise estimate of the prevalence of Rett syndrome of 1 per 22800 (0.44/10000) females aged 2 through 18 years of age was generated from this Registry. In addition, the first prevalence figures for black and Hispanic female cases were estimated. Registry cases are actively ascertamed from multiple sources. Registry staff identify presumptive cases from review of information provided to the Registry by the parent or guardian. Preliminary diagnostic evaluation includes standardized review of medical records and videotape of key behaviors. Diagnosis is confirmed at clinical evaluation. The active surveillance system is monitored with the two-source capture-recapture methodology and case ascertainment is projected. The 1990 prevalence estimate of Rett syndrome indicates that the syndrome occurs less frequently than previously estimated. Until a biologic marker for Rett syndrome is identified or a standard definition for an incident case of Rett syndrome is designated, the prevalence of Rett syndrome will remain a major investigative issue of its epidemiology, and the Registry will be an important, systematic mean to gather case material for clinical and laboratory studies providing the foundation for the development of preventive interventions.

Key Words: Rett syndrome registry • epidemiology • capture-recapture methodology • prevalence

Submitted on June 4, 1992
Accepted on October 6, 1992




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