Case-control studies examining HPV DNA in OSCCa.

OR – odds ratio; CP – consensus primers; HCII – Hybrid Capture 2; IHC – immunohistochemistry; ISH – in situ hybridization; LR – Low–risk HPV types; HR- High risk HPV types; PCR – Polymerase chain reaction. aSome of the data included in the table have been described in one of our previous publications [4].1All odds ratios in this table are unadjusted and have been calculated using STATA, except for 2 studies (Cao et al and Gao et al) where authors of the respective paper calculated adjusted odds ratios.2Some papers have ORs and p-values deemed as ‘incalculable’ due to one or more of the four components for OR calculation being a zero value. 3Maximum possible total score for a study was 100.