Table 3: Pathogenesis of ulcer in the duodenal ulcer group ( ).

Hp-positive patients ( )n (%)

Only HP-positive67 (44.1)
HP positive + NSAID and/or ASA exposure62 (40.8)

Hp negative patients ( )

NSAID and/or ASA exposure positive14 (9.2)
NSAID and ASA exposure negative9 (5.9)

ASA: acetylsalicylic acid; Hp: Helicobacter pylori; NSAID: nonsteroid anti-inflammatory drug.