TABLE 4

LRs for Components of the CBC According to Age at the Time of Testing Among Newborns With CBC and Blood Cultures Performed at <72 Hours of Age

Age at Time of CBC, hNo. With Infection, Total% of Those With Infection With Result% of Those Without Infection With Result
<11–3.99≥4
Total No. with infection649190245
% of all with infection263737100
LRLRLR
WBCs, × 103/μL
    0–4.99a27.680.546190.5
    5–9.991.42.46.453227.6
    10–14.991.10.651.0532225
    15–19.990.730.640.41451831
    ≥201.20.770.16482035
ANC, × 103/μL)
    0–0.997.533.511535140.4
    1–1.992.39.351.730121.1
    2–4.991.01.16.944189.6
    5–9.990.890.920.64702933.7
    ≥100.930.550.31652755.3
I/T
    0–0.14990.450.460.25612566
    0.15–0.2991.31.21.2692823
    0.3–0.44991.42.93.144187
    0.45–0.5994.83.38.837153
    ≥0.66.18.410.733152
  • 95% confidence intervals for LRs are available from the authors on request.

  • a The point estimate of this LR was 0, but there were only 56 infants in this cell.