Table 1 Confounder sets for multivariate analyses with anthropometric variables in the Netherlands Cohort Study on Diet and Cancer, 1986–1999*

Anthropometrics	Oesophagus		Stomach
Anthropometrics	Squamous cell carcinoma	Adenocarcinoma	Gastric cardia adenocarcinoma	Adenocarcinoma distant stomach	Adenocarcinoma stomach, NOS
BMI at baseline	Age	Age	Age	Age	Age
	Sex	Sex	Sex	Sex	Sex
	Smoking†			Smoking	Smoking
				Education‡	Education
					History of gastric ulcers or bleeding
BMI at age 20 years	Age	Age	Age	Age	Age
	Sex	Sex	Sex	Sex	Sex
	Smoking			Smoking	Smoking
				Education	Education
					History of gastric ulcers or bleeding
Change in BMI since	Age	Age	Age	Age	Age
age 20 years	Sex	Sex	Sex	Sex	Sex
	BMI at age 20 years	BMI at age 20 years	BMI at age 20 years	BMI at age 20 years	BMI at age 20 years
	Smoking			Smoking	Smoking
				Education	Education
					History of gastric ulcers or bleeding
Height at baseline	Age	Age	Age	Age	Age
	Sex	Sex	Sex	Sex	Sex
	BMI at baseline	BMI at baseline	BMI at baseline	BMI at baseline	BMI at baseline
	Smoking	Smoking	Smoking	Smoking	Smoking
	Alcohol intake			Education	Education
	Fruit consumption				History of gastric ulcers or bleeding

*NOS, not otherwise specified; BMI, body mass index.
†This confounder includes three variables; current smoking (yes/no), number of cigarettes/day and number of years of smoking.
‡This confounder refers to the highest level of education (primary school, lower vocational school, high school and higher vocational/university).