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Table 6 Factor analysis matrix of GERD Impact Scale items in four factors.

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

Symptom (frequency)

Regurgitation and effect on eat/sleep/work

Heartburn and effect on sleep

Additional medication

Sore throat/hoarseness

Pain behind breastbone

0.37

0.73

0.18

-0.28

Burning behind breastbone

0.23

0.76

0.00

0.40

Acid taste or regurgitation

0.83

0.10

-0.05

0.04

Sore throat or hoarseness due to heartburn or acid reflux

0.39

0.21

0.09

0.81

Difficulty sleeping due to heartburn or acid reflux

0.53

0.61

-0.02

0.20

Difficulty eating preferred foods due to heartburn or acid reflux

0.82

0.00

0.25

0.11

Difficulty working due to heartburn or acid reflux

0.77

0.31

0.05

0.04

Self-medication for heartburn or acid reflux

0.29

0.13

0.92

0.07

  1. Numbers in bold indicate correlation coefficient ≥ 0.5.