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Table 2 Evaluated parameters for CD4/CD8 ratio for the three infant age groups using DNA PCR as reference standard

From: T lymphocytes among HIV-infected and -uninfected infants: CD4/CD8 ratio as a potential tool in diagnosis of infection in infants under the age of 2 years

  0–18 months infant age group (n = 137) 0–11 months infant age group (n = 95) 12–18 months infant age group (n = 42)
%Sensitivity 98.7 (CI: 96.1–100) 98.2 (CI: 94.7–100) 100 (CI: 100–100)
%Specificity 98.4 (CI: 95.2–100) 97.5 (CI: 92.7–100) 100 (CI: 100–100)
%PPV 96.4 94.6 100
%NPV 99.4 99.2 100
%TE 98.5 (CI: 96.5–100) 97.9 (CI: 95.0–100) 100 (CI: 100–100)
  1. Abbreviations: n, number tested; NPV, negative predictive value; PPV, positive predictive value; TE, test efficiency.