Table 1.

Demographic variables by study group

	BO cases (N = 135)	GORD controls (N = 135)	Screening colonoscopy controls (N = 932)	Matched colonoscopy controls (N = 182)	p Value*	p Value†	p Value‡
Age	63.7 (11.2)	56.4 (11.1)	54.5 (8.9)	60.3 (10.18)	<0.0001	<0.0001	0.89
WHR	0.98 (0.06)	0.97 (0.07)	0.91 (0.09)	0.95 (0.09)	0.087	<0.0001	0.02
BMI	30.8 (5.7)	29.5 (5.6)	29.3 (6.9)	30.6 (6.0)	0.088	0.030	0.64
Gender (% female)	20.3%	40.0%	65.3%	29.7%	0.0003	<0.0001	0.12
Race (%)					0.0006	<0.0001	0.36
African-American	1 (0.7)	18 (13.3)	331 (35.8)	24 (13.2)
White	126 (93.3)	112 (83.0)	574 (62.0)	157 (86.3)
Other	1 (0.7)	0 (0)	27 (2.9)	0 (0.0)
Unknown	7 (5.2)	5 (3.7)	0 (0)	1 (0.5)

Values shown are mean (SD) or n (%).

^*p Value of difference between BO cases and GORD controls.

^†p Value of difference between BO cases and colonoscopy controls.

^‡p Value of difference between BO cases and matched colonoscopy controls.

BMI, body mass index; BO, Barrett’s oesophagus; GORD, gastro-oesophageal reflux disease; WHR, waist-to-hip ratio.