Table 3 Association between abdominal diameter and gastro‐oesophageal reflux‐type symptoms by ethnicity, with and without adjustment for body mass index.

		White		Black		Asian
	Total subjects*	Without adjustment for BMI	With adjustment for BMI	Without adjustment for BMI	With adjustment for BMI	Without adjustment for BMI	With adjustment for BMI
Total subjects		35 307	28 377	6207	4233	1621	1424
Abdominal diameter† (cm)		OR (95% CI)‡
<16.3	7966	1.00	1.00	1.00	1.00	1.00	1.00
16.3–17.9	10 288	1.01 (0.89 to 1.15)	1.01 (0.89 to 1.15)	0.80 (0.56 to 1.12)	0.80 (0.57 to 1.13)	0.86 (0.52 to 1.43)	0.83 (0.50 to 1.38)
18.0–19.9	15 688	1.17 (1.05 to 1.32)	1.12 (0.99 to 1.26)	0.76 (0.56 to 1.04)	0.75 (0.55 to 1.03)	1.02 (0.64 to 1.62)	0.91 (0.55 to 1.49)
20.0–21.9	17 153	1.38 (1.23 to 1.56)	1.22 (1.08 to 1.38)	1.03 (0.76 to 1.39)	0.98 (0.71 to 1.35)	1.13 (0.69 to 1.85)	0.80 (0.44 to 1.44)
22.0–23.9	12 776	1.82 (1.61 to 2.06)	1.47 (1.28 to 1.68)	1.06 (0.77 to 1.46)	0.85 (0.59 to 1.22)	1.09 (0.58 to 2.05)	0.62 (0.28 to 1.39)
24.0–25.9	7970	1.99 (1.73 to 2.29)	1.62 (1.37 to 1.91)	1.21 (0.86 to 1.71)	0.98 (0.64 to 1.50)	1.32 (0.61 to 2.84)	0.86 (0.30 to 2.44)
⩾26	8269	2.68 (2.33 to 3.08)	1.85 (1.55 to 2.21)	1.67 (1.18 to 2.36)	0.95 (0.61 to 1.48)	1.37 (0.52 to 3.57)	0.64 (0.18 to 2.30)
Test for trend§		p<0.01	p<0.01	p<0.01	p = 0.11	p = 0.18	p = 0.78

BMI, body mass index.

*Row totals by each category of abdominal diameter.

†Reference category is the lowest decile of abdominal diameter.

‡ORs adjusted for age at examination, current smoking status, BMI and current alcohol use (see text for details).

§Test for trend across categories of abdominal diameter.