Purpose: There exists meagre information on the prevalence of periodontal conditions among adults in Nepal. Therefore, appropriate data on periodontal conditions are needed to facilitate planning, monitoring and evaluation of oral health programmes. The objective of the present study was to determine the prevalence of periodontal conditions among adults aged between 33 and 97 years in Nepal and also to elucidate any possible risk predictors of periodontal problems. Materials and Methods: The total subjects included in the present study were 1210 (33 to 49 years [n = 596] and 50 to 97 years [n = 614]). Community Periodontal Index scores were used to assess the periodontal status of the selected subjects. Self-reported data were used to ascertain oral health behaviour. Results: Logistic regression analyses showed the following observations for the age group 33 to 49 years: (1) bleeding was more likely found among those subjects who resided in rural areas and upper hill terrain, and among those who used non-fluoridated dentifrice; (2) bleeding was, however, less likely to be observed among those with primary or unfinished secondary school education (PSE); (3) calculus deposits were accentuated in illiterates, whereas less calculus formation was experienced by alcohol users; (4) periodontal pocket 4 to 5 mm was predominantly seen among illiterates and those with PSE, smokers and those who used non-fluoridated dentifrice; (5) periodontal pocket v 6 mm was observed among illiterates and those with PSE and those who used non-fluoridated dentifrice. With regard to 50 years old and above, the following observations were noticed: (1) bleeding was associated with the use of non-fluoridated dentifrice; (2) chewing betel nut showed a protective effect with regard to calculus formation; (3) being illiterate increased the likelihood of having periodontal pockets 6 mm or more in depth. Conclusions: Several findings of the present study are in concordance with empirical evidence. However, the protective effect of alcohol and betel nut against calculus formation needs to be investigated further. Keywords: adults, CPI scores, Nepal, periodontal conditions