Systematic investigation of gastrointestinal diseases in China (SILC): validation of survey methodology

BMC Gastroenterology

Table 6 Correlation between Reflux Disease Questionnaire (RDQ) item score and dimension scores (correlation coefficients ≥ 0.6 are in bold).

RDQ item	Spearman correlation coefficient
	Regurgitation dimension	Heartburn dimension	GERD dimension	Dyspepsia dimension
Burning behind breastbone
Frequency	0.37	0.84	0.67	0.42
Severity	0.37	0.84	0.66	0.42
Pain behind breastbone
Frequency	0.31	0.85	0.63	0.40
Severity	0.32	0.86	0.64	0.41
Acid taste
Frequency	0.85	0.34	0.77	0.40
Severity	0.87	0.32	0.77	0.40
Movement of materials
Frequency	0.80	0.34	0.72	0.38
Severity	0.81	0.33	0.73	0.38
Epigastric burning
Frequency	0.42	0.46	0.52	0.78
Severity	0.40	0.44	0.50	0.78
Epigastric pain
Frequency	0.36	0.37	0.44	0.86
Severity	0.37	0.34	0.42	0.85

ISSN: 1471-230X