Body weight, lifestyle, dietary habits and gastroesophageal reflux disease

Table 1 Association between being overweight/obese and GERD-related symptoms

Author	Year	Country	Study design	Population size	Obesity index	Method of data collection	Association
Nilsson et al[42]	2003	Norway	Population-based	65 363	BMI	Questionnaire	Yes
Nandurkar et al[41]	2004	USA	Population-based	211	BMI	Validated questionnaire	Yes
Hampel et al[13]	2005	USA	Meta-analysis		BMI	Validated symptoms score	Yes
Corley et al[14]	2006	USA	Meta-analysis		BMI	Questionnaire	Yes
Jacobson et al[38]	2006	USA	Cross-sectional, women	10 545	BMI	Questionnaire	Yes
Nocon et al[39]	2006	Germany	Population-based	7124	BMI	Interview	Yes
Corley et al[37]	2007	USA	Cross-sectional	80 110	BMI and abdominal diameter	Questionnaire	Yes
Nocon et al[40]	2007	Germany	Population-based	6215	BMI	Validated questionnaire	Yes
Zheng et al[43]	2007	Sweden	Swedish twin registry	27 717	BMI	Questionnaire, telephone interview	Yes
Andersen et al[44]	1991	Denmark	Population-based	1321	BMI	Validated questionnaire	No
Lagergren et al[46]	2000	Sweden	Cross-sectional	820	BMI	Interview	No
Talley et al[45]	2004	Australia	Cross-sectional	777	BMI	Questionnaire	No
Zagari et al[47]	2008	Italy	Population-based	1033	BMI	Questionnaire	No