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Table 3 HPV detection rate and multiple infection rate by region*

From: Detection of HPV DNA in esophageal cancer specimens from different regions and ethnic groups: a descriptive study

  HPV L1(+)   
Region Unclassified
No. (%)
Single
infection
No. (%)
Multiple
infection
No. (%)
P Total
No. (%)
HPV L1
(-)
No. (%)
P
Anyang (N = 166) 20(23.3) 57(66.3) 9(10.5) 0.963† 86(51.8) 80(48.2) 0.131‡
Shantou (N = 103) 4(6.5) 43(69.4) 15(24.2)   62(60.2) 41(39.8)  
Xinjiang (N = 78) 6(14.3) 30(71.4) 6(14.3)   42(53.8) 36(46.2)  
China (N = 347) 30(15.8) 130(68.4) 30(15.8) 0.834†† 190(54.8) 157(45.2) 0.522‡‡
US (N = 88) 1(1.9) 40(74.1) 13(24.1)   54(61.4) 34(38.6)  
Total (N = 435) 31(12.7) 170(69.7) 43(17.6)   244(56.1) 191(43.9)  
  1. *Multiple infection was determined by type specific E6 or E7 PCR.
  2. †P value for the rates of multiple type infections among three areas of China was calculated by unconditional logistic regression adjusted for age, gender, tobacco, alcohol and pathological stage.
  3. ††P value for the rates of multiple type infections between China and US was calculated by unconditional logistic regression adjusted for age, gender, tobacco, alcohol and pathological stage.
  4. ‡P value for HPV detection rates among three areas of China was calculated by unconditional logistic regression adjusted for age, gender, tobacco, alcohol and pathological stage.
  5. ‡‡P value for HPV detection rates between China and US was calculated by unconditional logistic regression adjusted for age, gender, tobacco, alcohol and pathological stage.