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Frequency distribution SBS prevalence by feeling lack of Airflow
| SBS feeling lack of airflow | Yes (%) | No (%) | Sum (%) |
|---|---|---|---|
| Yes often | 102 (%87.9) | 14 (%12.1) | 116 (%100) |
| Yes some times | 114 (%88.4) | 15 (%11.6) | 129 (%100) |
| No never | 13 (%65) | 7 (%35) | 20 (%100) |
| Total (P=0.015) | 229 (%86.4) | 36 (%13.6) | 265 (%100) |
