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The proportion of cases with evidence of infection with HPV, stratified by histological grade of tumour
| All HPV | Genital HPV | Cutaneous-HPV1 | |
| CIN I | 47% (8/17) | 35% (6/17) | 29% (5/17) |
| CIN II | 56% (10/18) | 50% (9/18) | 28% (5/18) |
| CIN III | 45% (10/22) | 27% (6/22) | 23% (5/22) |
| Invasive | 42% (10/24) | 42% (10/24) | 13% (3/24) |
| TOTAL | 47% (38/81) | 38% (31/81) | 22% (18/81) |
1. χ2 (trend) = 1.9; p = 0.2
