Pattern matrix for the cress exploratory factor analysis
| Questionnaire item | Factor | ||
| 1 | 2 | 3 | |
| Indigestion | 0.90 | ||
| Stomach acid up | 0.87 | ||
| Heartburn | 0.82 | ||
| Acid or sour taste in mouth | 0.67 | ||
| Regurgitation | 0.61 | ||
| Belching | 0.59 | ||
| Bloating | 0.55 | ||
| Gurgling stomach | 0.51 | ||
| Flatulence | 0.40 | ||
| Nausea | 0.38 | ||
| Rush of saliva in mouth | 0.34 | ||
| Coughing when upright | 0.86 | ||
| Cough when lying | 0.75 | ||
| Coughing after eating | 0.72 | ||
| Wheezing | 0.65 | ||
| Mucus dripping in throat | 0.51 | ||
| Excess mucus | 0.51 | ||
| Difficulty breathing | 0.47 | ||
| Throat clearing | 0.44 | ||
| Hoarseness | 0.34 | ||
| Difficulty swallowing food | 0.86 | ||
| Difficulty swallowing liquids | 0.74 | ||
| Lump in throat | 0.59 | ||
| Feeling things stuck throat | 0.55 | ||
| Pain in throat | 0.47 | ||
| Choking | 0.34 | 0.46 | |
| Decreased appetite | 0.45 | ||
| Headache | 0.33 | ||