Human papillomavirus in upper digestive tract tumors from three countries

Table 5 Viral load of human papillomavirus 16 by country, physical status, and human papillomavirus 16 E6 variants

		n	Viral load/cell
			GM	95% CI	1P value
Oral cavity	All	39	0.064	0.022, 0.185
Country	Japan	7	0.047	0.028, 0.079	0.033
	Pakistan	27	0.037	0.010, 0.144
	Colombia	5	1.883	0.058, 61.21
Integrated form	Absent	2	0.001	-	0.048
	Present	37	0.081	0.028, 0.233
E6 variant	E-350G	13	1.081	0.249, 4.705	0.038
	Others	10	0.127	0.063, 0.256
Esophagus	All	24	0.121	0.053, 0.274
Country	Japan	9	0.072	0.023, 0.222	0.476
	Pakistan	9	0.124	0.019, 0.799
	Colombia	6	0.251	0.036, 1.737
Integrated form	Absent	2	0.161	-	0.601
	Present	22	0.118	0.049, 0.285
E6 variant	E-350G	8	0.444	0.101, 1.957	0.291
	Others	8	0.215	0.055, 0.847

¹P values were obtained by Kruskal-Wallis test or Mann-Whitney U test. CI: Confidence interval; GM: Geometric means.