IL1 composite genotype, that is, Rare (R)-allele carriage at IL1A 889 (+4845) and IL1B +3954 (+3953) [36], in case-control studies and association with susceptibility to chronic periodontitis.
nr = not reported. = association not found. = association found. 82% of study population is of Caucasian heritage; results found after multiple logistic regression analysis correcting for smoking status and age. Cases diagnosed as adult periodontitis. Cases diagnosed as mixed periodontitis status. In smokers.