Table 3. Association between body mass index and gastrointestinal symptoms adjusted for age, gender, smoking, and coffee.

*Adjusted for age, gender, and tobacco use

	Abdominal pain	P-value*	Heartburn	P-value*
	OR* (95% CI)		OR* (95% CI)
Underweight	0.6898645 (1.1294907–1.7363304)	0.00212	0.4947974 (0.9343668–1.4530207)	0.171
Normal	Reference		Reference
Overweight	1.4005859 (0.8506070–1.2007518)	0.90178	1.1666090 (1.0274439–1.4505025)	0.0231
Obese	1.0109108 (0.9558476–1.3875333)	0.1367	1.2211024 (1.3340731–1.9276195)	4.87E-07
	Nausea		Vomiting
	OR*	P-value*	OR*	P-value*
	(95% CI)		(95% CI)
Underweight	0.3017262 (1.2911259–2.1051443)	5.67E-05	0.03268754 (1.23098766–3.25427675)	0.004259
Normal	Reference		Reference
Overweight	1.6516623 (0.7019312–1.1227322)	0.32984	2.02561012 (0.45281964–1.33615043)	0.398594
Obese	0.8898773 (0.8549096–1.4082740)	0.45361	0.79305687 (0.54591376–1.66545404)	0.923076
						Bloating		Diarrhea
	OR*	P-value*	OR*	P-value*
	(95% CI)		(95% CI)
Underweight	2.1560078 (0.7981452–1.2572690)	0.99985	0.1566206 (0.7270219–1.3327373)	0.953
Normal	Reference		Reference
Overweight	1.0000218 (1.0874286–1.5646276)	0.004309	0.9909002 (0.9156083–1.4501820)	0.221
					Obese	1.3032764 (1.0824918–1.6020582)	0.006095	1.1541307 (1.3695401–2.1739560)	3.51E-06
	Constipation	P-value*
	OR* (95% CI)
Underweight	0.6531714 (0.8574391–1.3284841)	0.55408
Normal	Reference
Overweight	1.0682819 (0.8522383–1.2070363)	0.8705
Obese	1.0145765 (0.9813569–1.4286467)	0.0772