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Table 4 Number needed to screen for undiagnosed diabetes in various risk factor categories among the Tehranian adults.

From: High prevalence of undiagnosed diabetes and abnormal glucose tolerance in the Iranian urban population: Tehran Lipid and Glucose Study

Variables Men Women
  NNTSa 95% CI NNTSa 95% CI
Family history of diabetes (yes) 15.6 14.0–17.7 13.7 12.5–15.1
Blood pressure ≥ 140/90 mmHg 8.3 7.7–9.1 9.3 8.7–10.1
BMI ≥ 25 kg/m2 13.5 12.1–15.1 15.5 14.1–17.3
Abdominal obesity: waist circumference (cm)>102 in men and > 88 in women 8.0 8.4–8.7 12.5 11.5–13.8
Triglycerides > 2.8 mmol/l 10.8 9.8–11.9 7.8 7.3–8.4
HDL-C< 0.9 mmol/l 19.2 17.0–22.1 17.0 15.4–19.0
  1. a: Number needed to screen (95% confidence interval) was obtained by univariate logistic regression analysis.
  2. BMI: body mass index, CI: confidence interval, HDL-C: high-density lipoprotein cholesterol,