Table 1.

Characteristics of Selected Versus Nonselected Cases From the IMPACT Varicella Database

Health Status GroupHealthy ChildrenChildren With Leukemia
Case Review Subgroup Short, NCShort, CLong, CNCC
Number of cases32880808440
Mean age in years (SD)3.8 (3.2)3.8 (2.5)5.1 (3.3)6.6 (3.2)6.6 (3.3)
% Male58.2%56.2%53.8%48.8%62.5%
% White79.2%90.4%76.0%87.8%80.6%
Household VZV exposure39.9%41.2%42.5%36.9%40.0%
VZIG after exposure 3.0% 1.2% 2.5%46.4%45.0%
Complication group
 Primary varicella13.7% 5.0% 3.8%92.8%50.0%
 Minor infections42.1%45.0%30.0% 1.2% 7.5%
 CNS19.8%23.8%28.8% 1.2% 5.0%
 Isolated thrombocytopenia 4.6% 5.0%0 1.2% 2.5%
 Other complications19.8%21.2%37.0% 3.6% 35%   
Intensive care/ventilation1.8%/0.6%5.0%/2.5%16.2%/7.5%1.2%/1.2%5.0%/2.5%
Acyclovir treatment21.4%20.5%32.9%100%97.5%
Hospital days (mean, range)3 (1–7)3.5 (1–7)11 (8–57)6 (2–30)7 (2–16)
  • Short indicates hospitalized ≤7 days; NC, cases not chosen from IMPACT database; C, cases chosen from IMPACT database; and Long, hospitalized for >7 days.