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Table 2 Prevalence of elevated hemoglobin A1c and the number needed to screen at the time of HIV testing according to national screening guidelines

From: Clinic-based diabetes screening at the time of HIV testing and associations with poor clinical outcomes in South Africa: a cohort study

Outcome Noutcome/Ntotal % NNS % hyperglycemic cases identified % hyperglycemic cases missed
Overall
 Diabetes (HbA1c ≥ 6.5%) 26/1207 2.2 46.5 100 0
 Hyperglycemia (HbA1c ≥ 5.7%) 239/1207 19.8 5.1 100 0
Age ≥ 45 years
 Diabetes (HbA1c ≥ 6.5%) 10/143 7.0 14.3 38.5 61.5
 Hyperglycemia (HbA1c ≥ 5.7%) 45/143 31.5 3.1 18.8 80.3
BMI ≥ 25 kg/m2
 Diabetes (HbA1c ≥ 6.5%) 19/685 2.8 36.0 73.1 26.9
 Hyperglycemia (HbA1c ≥ 5.7%) 153/685 22.3 4.5 64.0 36.0
Age ≥ 45 years and/or BMI ≥ 25 kg/m2
 Diabetes (HbA1c ≥ 6.5%) 20/729 2.7 36.5 76.9 23.1
 Hyperglycemia (HbA1c ≥ 5.7%) 163/729 22.4 4.5 68.2 31.8
  1. BMI body mass index, HbA1c hemoglobin A1c, NNS number needed to screen