Table 1. Distribution of sociodemographic variables between the groups of patients with and without anemia.a.

Variable	Patients with anemia	Patients without anemia	OR (95% CI)	p
	(n = 148)	(n = 18)
Gender
Male	116 (78.4)	10 (55.6)	2.90 (1.05-7.95)	0.03
Female	32 (21.6)	8 (44.4)
Age, yearsb	38.6	37.6		0.71
Smoking status
Smokers	70 (47.3)	9 (50.0)	2.70 (0.98-7.41)	0.05
Former smokers	38 (25.7)	1 (5.6)
Never smokers	32 (21.6)	8 (44.4)
ND	8 (5.4)	0 (0.0)
Illicit drug use
Yes	43 (29.1)	4 (22.2)	1.58 (0.49-5.09)	0.43
No	95 (64.2)	14 (77.8)
ND	10 (6.8)	0 (0.0)

^ND: no data

^aValues expressed as n (%), except where otherwise indicated

^bValues expressed as mean.