Table 3 

Relative rates* of typespecific and combined HPV infection clearance according to viral load 

Relative rate (95%CI) 



HPV type 
Viral load tertile 
No. of Events/No. Eligible cases 
Unadjusted 
Adjusted 


16 
Third 
5/27 
1.0 
1.0 
Second 
8/27 
1.52 (0.494.69) 
1.31 (0.414.20) 

First 
13/27 
2.55 (0.907.24) 
2.38 (0.826.89) 



18 
Third 
4/13 
1.0 
1.0 
Second 
3/13 
1.64 (0.318.78) 
1.14 (0.187.35) 

First 
11/13 
4.76 (1.2318.45) 
4.61 (1.1718.05) 



31 
Third 
6/10 
1.0 
1.0 
Second 
3/10 
0.87 (0.213.69) 
0.80 (0.193.44) 

First 
2/9 
0.67 (0.162.75) 
0.66 (0.152.97) 



45 
Third 
3/6 
1.0 
1.0 
Second 
4/6 
1.99 (0.2119.02) 
1.59 (0.1516.91) 

First 
3/6 
2.25 (0.2025.09) 
2.06 (0.1724.27) 



Above HPV types combined 
Third 
20/55 
1.0 
1.0 
Second 
22/55 
1.45 (0.792.64) 
1.49 (0.812.74) 

First 
24/56 
2.11 (1.163.86) 
2.21 (1.194.10) 



* Using Cox proportional hazards regression. Rate of clearance for third viral load tertile (highest) taken as referent. For the analysis of combined types the observations are not independent and required a robust variance estimator. Adjusted relative rates were estimated in models that included age and sexual partners as covariates. 

Ramanakumar et al. BMC Infectious Diseases 2010 10:326 doi:10.1186/1471233410326 