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Table 2 Acquisition of new human papillomavirus (HPV) infection during one and half years, in female students negative for the corresponding HPV type(s). Busan, Korea

From: Acquisition of new infection and clearance of type-specific human papillomavirus infections in female students in Busan, South Korea: a follow-up study

HPV type No. of women at risk (HPV-negative at baseline) No. of new Infections at follow-up Acquisition of new infection, % (95% CI)
High-risk    
16 195 17 8.7
18 196 8 4.1
31 195 3 1.5
33 196 1 0.5
35 197 6 3.0
39 196 2 1.0
45 197 0 0.0
51 190 1 0.5
52 195 4 2.1
56 196 0 0.0
58 196 2 1.0
59 196 2 1.0
66 196 2 1.0
68 194 2 1.0
Overall HR 181 23 12.7 (7.9–17.6)
Low-risk    
6 197 4 2.0
11 196 0 0.0
34 197 0 0.0
40 197 0 0.0
42 197 0 0.0
43 197 2 1.0
44 197 1 0.5
53 196 1 0.5
54 196 3 1.5
70 196 0 0.0
74 195 1 0.5
X 190 13 6.8
Overall LR 187 15 8.0 (4.1–11.9)
Any type 171 30 17.5 (11.8–23.2)
  1. X: undetermined HPV type; CI: confidence interval; HR: high-risk; LR: low-risk.