Increased expression of advanced glycation endproducts in the gingival crevicular fluid compromises periodontal status in cigarette-smokers and waterpipe users

Table 4 Correlation of probing depth and clinical attachment loss with advanced glycation endproducts in cigarette-smokers, waterpipe users and never-smokers

Groups	Confidence interval	R.²	P-value
Probing depth
Cigarette-smokers	− 80.9 to 85.4	0.0018	0.95
Waterpipe-users	− 28.03 to 68.7	0.027	0.40
Controls	− 69.2 to 15.44	0.06	0.21
Clinical attachment loss
Cigarette-smokers	− 34.5 to 55.6	0.421	0.19
Waterpipe-users	− 19.6 to 32.1	0.524	0.25
Controls	− 25.2 to 37.6	0.414	0.19

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