| SQ | Sleep Quality |
| PSQI | Pittsburgh Sleep Quality Index |
| OR | Odds Ratio |
| MENA | Middle Eastern & North African |
| AHI | Apnea-Hypopnea Index |
| STROBE | Strengthening the reporting of observational studies in epidemiology |
| WHO | World Health Organisation |
| P | Population Proportion |
| GERD | Gastroesophageal Reflux Disease |
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