Threshold values of sagittal abdominal diameter for the detection of cardio-metabolic risk factors in Northeastern Mexico: a cross-sectional study

Threshold values of sagittal abdominal diameter for the detection of cardio-metabolic risk factors in Northeastern Mexico: a cross-sectional study

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Background: The use of sagittal abdominal diameter (SAD) has been proposed for screening cardio-metabolic risk factors; however, its accuracy can be influenced by the choice of Astragalus thresholds values.Aim: To determine the SAD threshold values for cardio-metabolic risk factors in Mexican adults; to assess whether parallel and serial SAD testing can improve waist circumference (WC) sensitivity and specificity; and to analyze the effect of considering SAD along with WC and body mass index (BMI) in detecting cardio-metabolic risk.Methods: This cross-sectional study was conducted during 2012-2014 in Northeast Mexico (n = 269).Data on anthropometric, clinical, and biochemical measurements were collected.

Sex-adjusted receiver-operating characteristic curves (ROC) were obtained using hypertension, dysglycemia, dyslipidemia and insulin resistance as individual outcomes and metabolic syndrome as a composite outcome.Age-adjusted odds ratios and 95% confidence intervals (CI) were estimated using logistic regression.Results: The Binoculars threshold value for SAD with acceptable combination of sensitivity and specificity was 24.6 cm in men and 22.

5 cm in women.Parallel SAD testing improved WC sensitivity and serial testing improved WC specificity.The co-occurrence of high WC/high SAD increased the risk for insulin resistance by 2.4-fold (95% CI: 1.

1-5.3), high BMI/high SAD by 4.3-fold (95% CI: 1.7-11.

9) and SAD alone by 2.2-fold (95% CI: 1.2.-4.

2).Conclusions: The use of SAD together with traditional obesity indices such as WC and BMI has advantages over using either of these indices alone.SAD may be a powerful screening tool for interventions for high-risk individuals.