HPV 16   patients-pigmentacije Control Total Yes N 15 5 20 HP 75% 25% 100% VP 50% 16.70% 33.30% No N 15 25 40 HP 37.50% 62.50% 100% VP 50.00% 83.30% 66.70% Total N 30 30 60 HP 50% 50% 100% X2-TEST   X2 = 7.500 DF=1 P=0.006

Table 2: Contingency tables presence of HPV 16 in groups of patients with pigmetacijama and x2-test result