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Table 4 Spearman correlation coefficient between RDQ item score and RDQ dimension score.

From: Validation of a survey methodology for gastroesophageal reflux disease in China

RDQ item

Heartburn dimension

Regurgitation dimension

GERD dimension

Epigastric pain dimension

Burning behind breastbone – severity

0.62

0.34

0.38

0.32

Burning behind breastbone – frequency

0.62

0.34

0.38

0.32

Pain behind breastbone – severity

0.93

0.32

0.56

0.59

Pain behind breastbone – frequency

0.93

0.32

0.56

0.59

Acid taste – severity

0.32

0.91

0.84

0.44

Acid taste – frequency

0.32

0.91

0.84

0.43

Movement of materials – severity

0.42

0.72

0.67

0.39

Movement of materials – frequency

0.43

0.72

0.67

0.39

Upper stomach burning – severity

0.54

0.41

0.44

0.68

Upper stomach burning – frequency

0.54

0.41

0.44

0.68

Upper stomach pain – severity

0.58

0.45

0.56

0.94

Upper stomach pain – frequency

0.58

0.45

0.56

0.94

  1. Numbers in bold indicate correlation coefficient ≥ 0.6.
  2. GERD: gastroesophageal reflux disease; RDQ: Reflux Disease Questionnaire