Table 2. Characteristics of gasoline station workers and controls.

Characteristics		Gasoline station workers (n=62)		Controls (n=62)		Test of significant	p
Age (yr):						t=1.57	0.119
Mean ± SD		34.47 ± 9.61		36.87 ± 7.27
Residence:		No	%	No	%
	• Rural	28	45.2	19	30.6	χ2=2.78	0.096
	• Urban	34	54.8	43	69.4
Smoking:
	• Smokers	44	71.0	51	82.3	χ2=2.21	0.138
	• Non-smokers	18	29.0	11	17.7
Duration of smoking:
Mean ± SD		15.15 ± 11.01		16.82 ± 7.17		χ2=1.67	0.319

NB: There is no history of alcohol consumption in all the study participants.