Table 10.

Correlation coefficients to assess relationship between gingival crevicular fluid free haem concentration and clinical parameters in diseased sites

Variables	Smokers		Nonsmokers
	r	P	r	P
GI	0.02	0.92	0.16	0.33
PI	0.12	0.47	−0.17	0.32
PBI	0.12	0.47	0.30	0.06
PD	−0.15	0.37	0.01	0.98
CAL	−0.16	0.34	0.01	0.99

Correlation coefficient range: 0.0 – No correlation; 0.01-0.20 – Very weak correlation; 0.21-0.40 – Weak correlation; 0.41-0.60 – Moderate correlation; 0.61-0.80 – Strong correlation; 0.81–1.00 – Very strong correlation. S – Statistically significant (P<0.05); NS – Statistically nonsignificant (P>0.05); GI – Gingival index; PI – Plaque index; PBI – Papillary bleeding index; PD – Pocket depth, CAL – Clinical attachment level; r – Correlation coefficient range; P – Level of Significance