Table 2.

Baseline characteristics by quartiles of serum gastrin and CCK concentration in the 778 ATBC Study controls

	Gastrin
Characteristics	Q1 (< 9.47 pmol/l)	Q2 (9.48–13.88 pmol/l)	Q3 (13.91–22.00 pmol/l)	Q4 (> 22.10 pmol/l)	aPtrend
Number of controls	190	193	191	191
Age at baseline (years)	58	58	58	59	0.23
Mean years of smoking	36	36	36	36	0.50
Mean cigarettes/day	19	18	20	19	0.96
Alcohol: g/day	15	15	16	14	0.35
Education: post-elementary school %	23	17	20	11	0.01
Body mass index: kg/m2	26	27	26	26	0.82
Fruit: g/day	240	198	205	201	0.16
Vegetables: g/day	314	275	281	291	0.11
Helicobacter pylori: % positive	88	94	95	95	0.05

	Cholecystokinin
Characteristics	Q1 (< 0.47 pmol/l)	Q2 (0.48–1.00 pmol/l)	Q3 (1.01–1.46 pmol/l)	Q4 (> 1.47 pmol/l)	aPtrend
Number of controls	189	193	191	191
Age at baseline	58	58	59	59	0.05
Mean years of smoking	37	35	34	37	0.73
Mean cigarettes/day	19	20	18	19	0.71
Alcohol: g/day	21	15	13	11	0.0001
Education: post-elementary school %	17	18	22	14	0.71
Body mass index: kg/m2	26	27	26	26	0.82
Fruit: g/day	177	233	231	202	0.16
Vegetables: g/day	272	298	299	290	0.04
Helicobacter pylori: % positive	99	95	88	91	0.01

^aMantel-Haenszel trend test for categorical variables and Jonckheere-Terpstra test for trend for continuous variables.