Fig. 3
From: Findings from a Malaysian multicentre study on oropharyngeal squamous cell carcinoma
Kaplan Meier estimates of overall survival stratified according to history of betel quid use in combination with HPV status. All HPV-associated OPSCC patients were found to have never used (chewed) betel quid and had much better overall survival rates compared to the other sub-groups (Log-rank test, pooled over strata; p < 0.001; n = 117). However, pairwise statistical comparisons between patients with HPV-independent OPSCC who had no history of betel quid usage and those that did, showed no statistically significant difference (Log-rank test, pairwise over strata; p = 0.738; n = 117)