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Results of the multiple regression modeling with global GIQLI score as a dependent factor
| Independent variable | t-test statistics | P value | Variance inflation factor |
| Pretreatment/treatment | 4.989 | < 0.001 | 1.31 |
| Age | -0.725 | 0.469 | 1.31 |
| Gender (m/f) | -2.684 | 0.008 | 1.06 |
| Smoking habit | 1.038 | 0.301 | 1.02 |
| Symptoms duration | -1.813 | 0.072 | 1.08 |
| Presence of symptoms | -4.932 | < 0.001 | 1.31 |
| Associated diseases | -1.824 | 0.070 | 1.18 |
