Table 8.

Comparison of mean gingival crevicular fluid free haem concentration (ng/ml) based on N-benzoyl-DL-arginine-2-naphthylamide test in smokers and nonsmokers among healthy subjects using independent student’s t-test

Group	Marker	BANA	n	Mean±SD	Mean difference	P
Smokers	Free haem concentration	Positive	10	22.86±3.91	−0.04	0.98
		Negative	29	22.91±3.56
Nonsmokers	Free haem concentration	Positive	19	21.95±4.25	0.00	1.00
		Negative	20	21.95±5.50

n – Sample size; SD – Standard deviation; BANA – N-benzoyl-DL-arginine-2-naphthylamide; ng – Nano gram; ml – Millilitre; P = 0.001