Table 1.

Characteristics of patients with OGIB, per study group.

Characteristic	Occult OGIB	Overt OGIB	P value
	(n = 102)	(n = 325)
Sex ratio (male/female)	50/52	198/127	<0.05
Age (years)	65.2 ± 17.3	65.3 ± 15.8	NS
Mean time from the first OGIB episode (months)	2.8 ± 2.7	1.7 ± 2.7	NS
Mean hemoglobin concentration at time of examination (g/dL)	7.8 ± 2.1	8.2 ± 2.7	NS
Plasma ferritin (mg/L)	10.1 ± 8.9	137.8 ± 210	0.0003
Blood transfusion	16 (16%)	110 (34%)	<0.01

Number of patients or mean ± SD values are shown.

NS: not significant.