Fig. 3

Odd ratios (95% CI) of non-secretor status in oral cancers and premalignant oral conditions compared to healthy controls, by pooling data from 8 studies (n = 1920). Note: In the study of Hallkeri et al., 2014, data of two groups; ´patients with a tobacco-related habit, but no lesions´ and ´healthy controls´ were combined as the control group because there were no pathological changes in both the groups