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Table 1 General information of the animals in group A and B

From: Chronic hepatitis B virus infection and occurrence of hepatocellular carcinoma in tree shrews (Tupaia belangeri chinensis)

Group Animal Sex Period of observation (week) a Condition at the end of study b
A 90-1 F 323 Sacrificed for a suspected liver tumor which was confirmed as liver cell dysplasia microscopically*.
  97-1 M 88 Natural death.
  98-2 F 319 Sacrificed because of HCC.
  121-1 M 278 Sacrificed because of HCC.
  122-1 M 190 Natural death.
  123-3 M 276 Alive.
  Mean ± SD   245.67 ± 90.86c  
B 108-4 F 311 Alive.
  117 F 206 Natural death.
  122-2 F 280 Alive.
  131-3 F 262 Alive.
  133-2 F 246 Natural death.
  133-3 F 260 Alive.
  136-2 M 241 Natural death.
  137-2 F 220 Alive.
  140-3 F 216 Alive.
  Mean ± SD   249.11 ± 33.44c  
  1. aPeriod of observation, equals to the age of animal because all animals in this study were inoculated at birth and observed since then.
  2. bNatural death, the death was without clear cause.
  3. cThe difference of observation period between two groups was not statistically significant (P = 0.607, Wilcoxon W = 67).
  4. *Reference: Ruan P, Yang C, Su J, Cao J, Ou C, Luo C, Tang Y, Wang Q, Yang F, Shi J, et al.: Histopathological changes in the liver of tree shrew (Tupaia belangeri chinensis) persistently infected with hepatitis B virus. Virol J 2013, 10:333.