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Table 3 Phase II study design and non-genetic covariates.

From: Genetic factors leading to chronic Epstein-Barr virus infection and nasopharyngeal carcinoma in South East China: Study design, methods and feasibility

Exposure EBV/IgA/VCA status
  NPC/IgA+ IgA+ IgA-
No. enrolled1 1024 1009 1022
Male: female(% male) 735/289(72%) 555/454(55%) 684/338(67%)
Consume dried meat2 292 (28.5%) 172 (17.0%) 283 (27.7%)
Wood cooking fires2 995 (97.2%) 960 (95.1%) 914 (89.4%)
Occupational exposure to solvents2 78 (07.6%) 31 (03.1%) 87 (08.5%)
Smoking > 10 years 531 (51.9%) 408 (40.4%) 372 (36.4%)
  1. Abbreviations: EBV, Epstein-Barr virus; IgA, immunoglobulin A; NPC, nasopharyngeal carcinoma; VCA, viral capsid antigens.
  2. 1 Greater than 99 per cent of IgA+ and IgA- participants and 100 per cent of the NPC cases were born in Guangdong or Guangzhou provinces.
  3. 2 Participants reporting any level exposure.