(b)

Risk factors	B	S.E.	Wald	P value	OR	95% CI
Gender	0,112	0.058	3.756	0.053	1.12	1.00–1.25
Age	−0.04	0.004	88.709	0.000	0.96	0.95–0.97
Kipper food	0.142	0.115	1.524	0.217	1.15	0.92–1.44
Frequency of eating pickled foods	−0.003	0.006	0.254	0.614	1.00	0.99–1.01
Frequency of eating fried foods	0.045	0.035	1.697	0.193	1.05	0.98–1.12
Digestive disease	0.131	0.155	0.705	0.401	1.14	0.84–1.54
Gastroenteritis	−0.493	0.166	8.795	0.003	0.61	0.44–0.85
Peptic ulcer	−0.51	0.193	7.001	0.008	0.6	0.41–0.88