Psychosocial and sexual behaviours of STD clinics attendees who did and did not practice oral sex.

aThe percentage of attendees may not add up to 100% due to non-response for some items.bOR: unadjusted odds ratio; CI: confidence interval.cReference category.dSTD mainly refers to gonorrhea, syphilis, chancroid, condyloma acuminatum, chlamydia, genital herpes, non-gonococcal urethritis, etc. in this research.eSTD-related symptoms refers to such symptoms as feeling pain or burning during one’s micturition, abnormal sexual organ secretion, anal ulcer or pain, skin damage or neoplasm on sexual organs, etc. in this research.