Table 2. Quantitative Morphological Data by Group and Cell Type.

Group	Cell Type	NV (mm−3)		NA nucleus (mm−2)		NA cell (mm−2)
		Mean		mean		mean
non-smokers	CD68+	85987	9.7%	350	10.1%	569	7.6%
	CD3+	228612	9.3%	N. A.	N. A.	931	9.3%
smokers	CD68+	46025	11.5%	163	12.4%	534	6.6%
	CD3+	91870	10.4%	N. A.	N. A.	322	11.2%

Definition of abbreviations: N_V  =  numerical density, N_{A nucleus}  =  nuclear profile per unit area, N_{A cell}  =  cell profile per unit area,  =  coefficient of error of the mean estimate, N. A.  =  not analysed