Table 1.

Characteristics of esophageal cancer cases and controls

	Control	Case		Esophageal Adenocarcinoma
Variables	n(%)	n(%)	P⊥	n(%)	P*
age, mean(SD)	63.20(10.63)	63.30(11.00)	0.905	62.63(10.41)	0.496
packyr, mean(SD)	32.78(30.02)	40.35(32.36)	0.014	39.49(30.78)	0.030
BMI€,¥, mean(SD)	28.83(5.16)	29.74(5.51)	0.041	30.12(5.53)	0.005
Sex
Male	306(88.44)	306(88.44)		270(91.22)
Female	40(11.56)	40(11.56)	1.000	26(8.78)	0.248
Total	346	346		296
Smoking status
Never	154(44.51)	78(22.54)		67(22.64)
Ever	192(55.49)	268(77.46)	<0.001	229(77.36)	<0.001
Former	163(47.11)	194(56.07)		163(55.07)
Current & RQ**	29(8.38)	74(21.39)	<0.001	66(22.30)	<0.001
Total	346	346		296
Drink alcohol¥
Yes	308(90.86)	225(90.73)		200(91.74)
No	31(9.14)	23(9.27)	0.957	18(8.26)	0.718
Total	339	248		218

^⊥P value for testing differences between controls and all the esophageal cancer cases

^*P value for testing differences between controls and esophageal adenocarcinoma cases

^€BMI is calculated using the usual weight over the last 3 years

^¥Missing usual weight and alcohol for 98 cases

^**RQ - recent quitter