Table 1: Demographic features and risk in the study groups.

Control
( )
Duodenal ulcer
( )
P value

Median (min–max)
Age (years)41.0
(18–68)
41.0
(16–71)
0.342a
n (%)
Male gender40 (57.1)89 (58.6)0.843b
Alcohol consumption3 (4.3)15 (9.9)0.157b
Smoking29 (41.4)53 (34.9)0.347b
ASA use6 (8.6)22 (14.5)0.218b
NSAID use22 (31.4)62 (40.8)0.181b

ASA: acetylsalicylic acid; NSAID: nonsteroidal anti-inflammatory drugs; aMann-Whitney test; bChi-Square z test.