Dataset Information

Triple test screening for Down syndrome: an Egyptian-tailored study.

ABSTRACT: BACKGROUND:The incidence of Down syndrome (DS) in Egypt varies between 1:555 and 1:770 and its screening by triple test is becoming increasingly popular nowadays. Results, however, seem inaccurate due to the lack of Egyptian-specific information needed for risk calculation and a clear policy for programme implementation. Our study aimed at calculation and validation of the triple marker medians used in screening Egyptian females as well as to recommend programme conventions to unify screening in this country. METHODS:The study was conducted on 668 Egyptian women, in weeks 15-20 of pregnancy as proven by sonar. Chorionic gonadotropin (CG), ?-fetoprotein (AFP) and unconjugated oestriol (uE3) were measured on Siemens Immulite analyzer. Medians of the three parameters were calculated, regressed against gestational age (GA) and weighted by the number of participants/week. Equations were derived to adjust each parameter to the maternal weight and were centered on the median Egyptian weight. Prisca software was fed with the above data, multiples-of-median (MoM) and DS risks were calculated and the screening performance was evaluated at a mid-trimester risk cutoff of 1:270. RESULTS:Log-linear [AFP/uE3?=?10(A+B*GA)] and exponential equations [CG?=?A*e (B*GA)] were derived and the regressed medians were found to follow similar patterns to other Asian and Western medians. Oestriol was always lowest (even halved) while CG and AFP were intermediate. A linear reciprocal model best fitted weight distribution among Egyptians and successfully adjusted each parameter to a weight of 78.2 kg. Epidemiological monitoring of these recommendations revealed satisfactory performance in terms of 6.7% initial positive rate and 1.00 grand MoM. CONCLUSIONS:Adoption of the above recommendations is hoped to pave the way to a successful DS screening programme tailored to Egyptian peculiarities.

SUBMITTER: Abou-Youssef HS

PROVIDER: S-EPMC4203785 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Triple test screening for Down syndrome: an Egyptian-tailored study.

Abou-Youssef Hazem S HS Kamal Manal M MM Mehaney Dina A DA

PloS one 20141020 10

<h4>Background</h4>The incidence of Down syndrome (DS) in Egypt varies between 1:555 and 1:770 and its screening by triple test is becoming increasingly popular nowadays. Results, however, seem inaccurate due to the lack of Egyptian-specific information needed for risk calculation and a clear policy for programme implementation. Our study aimed at calculation and validation of the triple marker medians used in screening Egyptian females as well as to recommend programme conventions to unify scre ...[more]

PMID: 25330176

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Project description:Background. Individuals at average risk for colorectal cancer (CRC) have multiple test options. Preference for a specific test modality may affect decision making about CRC screening. The current study examined 1) the sociodemographic and health belief characteristics of average-risk participants with a test preference for stool blood test (SBT) versus those with a preference of colonoscopy, and following receipt of a tailored CRC screening intervention, 2) the percentage of participants who completed a preference-concordant CRC screening test, and 3) the sociodemographic, health care experience, and health belief characteristics and intervention group(s) associated with completion of a preference-concordant screening test. Methods. Participants (N = 603) were female, aged 50 to 75 years, at average CRC risk, not currently up-to-date with CRC screening recommendations, had Internet access, and were randomized to receive 1 of 3 tailored CRC screening promotion interventions. Multivariable logistic regression analyses were conducted. Results. Most women (64%) preferred SBT, whereas 36% preferred colonoscopy. There were significant differences in test preference by age, stage of change for the specific tests, perceived benefits of CRC screening, perceived barriers to both tests, and self-efficacy for colonoscopy. Two hundred thirty participants completed CRC screening at 6 months post-intervention. Of those, most (84%) completed a test concordant with their preference. Multivariable analyses revealed that compared with participants completing a preference-discordant test, those completing a preference-concordant test were older (P = 0.01), had health insurance (P < 0.05), and were in the phone counseling-only group (P < 0.01). Conclusions. High levels of completion of preference-concordant CRC screening can be achieved by educating average-risk patients about the multiple screening test options, soliciting their preferences, and offering testing that is concordant with their preference.

Project description:ObjectiveTo evaluate the efficacy of the quadruple test for potential use as a Thai national policy for Down syndrome (DS) screening and establish an accurate equation for risk estimation of Down syndrome based on gestational age, weight and the ethnic-specific reference range of our population.MethodsA prospective study was conducted on singleton pregnancies at 14 to 21 weeks of gestation to evaluate the efficacy of quadruple DS screening using the automatically calculated Western European descent factor (WF) in our population and the impact of screening using a specific Thai ethnic factor as well as to establish an equation for the risk estimation of DS based on gestational age, weight and a local Thai ethnic factor to correct for the impact of ethnic factor on the screening efficacy.ResultsOf a total of 5,515 women, 12 cases of DS and 8 cases of other aneuploidies were found. The detection rate, false positive rate and specificity were 75.0%, 9.1% and 90.9%, respectively, by automatic calculation with the widely used WF; the screening efficacy was lower when used in Asian populations than in other studies. The best-fitted regression equation of serum quadruple screening of AFP, free β-hCG, uE3 and inhibin A was established by adjustment for gestational age (GA) in days, maternal weight and our Thai-specific ethnic reference range which was created for this study. Calculations with our Thai-specific ethnic model gave a better detection rate of 83.3%, a false positive rate of 9.6% and specificity of 90.4%.ConclusionThe serum quadruple test had a lower detection rate than expected when the risk estimation was based on the WF reference range. The serum quadruple test using WF had significantly different levels when corrected with our ethnic-specific factor. Using our local ethnic specific model could increase the detection rate of DS screening in Thailand with a minimal increase in false positive rates. Our findings indicate that DS screening should be adjusted with an appropriate individual ethnic factor when used for national screening.

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Dataset Information

Triple test screening for Down syndrome: an Egyptian-tailored study.

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Triple test screening for Down syndrome: an Egyptian-tailored study.

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