Table 1. Age and sex distribution sample.

Adapted from [17].

	Smokers		Non-smokers		P
	Mean	SD	Mean	SD
Age (years)	38	14.8	34	15.3	0.23
Sex
Male	37	93%	22	57.4%	0.00007
Female	1	3%	16	42.4%	0.00003