Table 4.

Comparison of mean gingival crevicular fluid free haem concentration (ng/ml) at healthy and diseased sites between smokers and nonsmokers group using independent Student’s t-test

Sites	Group	n	Mean±SD	Mean difference	P
Healthy sites	Smokers	39	22.90±3.60	0.95	0.33 (NS)
	Nonsmokers	39	21.95±4.86
Diseased sites	Smokers	39	25.98±4.83	−0.72	0.51 (NS)
	Nonsmokers	39	26.70±4.80

S – Statistically significant (P<0.05); NS – Statistically nonsignificant (P>0.001); n – Sample size; SD – Standard deviation; ng – Nanogram; ml – Milliliter; P – Level of Significance