Table 1.

Characteristics of controls and cases

	All controls (n=347)	Primary care controls (n=118)	Endoscopy controls (n=229)	BE cases (n=70)
Variable	n (%)	n (%)	n (%)	n (%)
Age, Mean years (s.d.)	58.4 (8.1)	60.4 (5.7)	57.4 (8.9)	59.9 (8.1)
Males	292 (84.1)	110 (93.2)	182 (79.5)	68 (97.1)
White	187 (53.9)	53 (44.9)	134 (58.5)	63 (90.0)
GERD ever	211 (67.8)	40 (40.4)	171 (80.7)	53 (82.8)
Smoking status
Never	95 (32.0)	28 (29.5)	67 (33.2)	13 (20.3)
Ex-smoker	115 (38.7)	38 (40.0)	77 (38.1)	32 (50.0)
Current smoker	87 (29.3)	29 (30.5)	58 (28.7)	19 (29.7)
Ever used NSAIDs	173 (57.7)	59 (61.5)	114 (55.9)	42 (65.6)
Ever used PPIs	152 (50.7)	21 (21.9)	131 (64.2)	45 (70.3)

GERD, gastroesophageal reflux disease; NSAIDs, non-steroidal anti-inflammatory drugs; PPI, proton pump inhibitor.