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Table 1 Patient and control characteristics.

From: High incidence of Epstein-Barr virus, cytomegalovirus and human herpesvirus 6 infections in children with cancer

Cancer diagnosis Number of patients Mean age and range* Treatment duration – mean and range**
Leukemia group – total 77 6.44 (0.5–16.0) 1.54 (0.7–2.2)
- Acute lymphoblastic leukemia 62   
- Acute myeloid leukemia 14   
- Myelodysplastic syndrome 1   
Lymphoma group – total 42 12.07(2.0–17.8) 0.81 (0.6–1.0)
- Hodgkin's disease 27   
- Non-Hodgkin's lymphoma 15   
Histiocytosis group – total 9 3.34 (0.3–12.7) 0.72(0.5–1.0)
- Class I. 7   
- Class II. 2   
Solid tumor group – total 58 7.41 (0.7–17.5) 0.96 (0.5–2.0)
- Brain tumors 21   
- Neuroblastoma and PPNET*** 10   
- Wilms tumor 7   
- Soft tissue sarcoma 7   
- Retinoblastoma 5   
- Osteosarcoma 5   
- Ewing sarcoma 3   
Total 186 7.86(0.3–17.5) 1.15 (0.5–2.2)
Controls – pediatric 218 8.21 (0.3–17.3) -
- adult 165 47.53(19–78) -
  1. * Mean age in years at the time of cancer diagnosis; (range). ** Mean interval in years between sample taken at the time of cancer diagnosis and the time 2 months after the completion of anti-cancer treatment; (range). *** 8 patients with neuroblastoma (2 patients with stage II., 2 patients with stage III. and 4 patients with stage IV.) and 2 patients with PPNET = peripheral primitive neuroectodermal tumor.