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Prevalence of HHS and non-HHS stratified by comorbidity
| Comorbidity | HHS | Non-HHS | P value | ||
|---|---|---|---|---|---|
| No. | % | No. | % | ||
| Lower extremity malformation | 15 | 7.5 | 87 | 6.0 | |
| Spine malformation | 2 | 1.0 | 3 | 0.2 | |
| Facial malformation | 3 | 1.5 | 7 | 0.5 | |
| Thoracic malformation | 0 | 0.0 | 2 | 0.1 | |
| Kidney malformation | 2 | 1.0 | 0 | 0.0 | |
| Anemia | 0 | 0.0 | 1 | 0.1 | |
| Total | 22 | 11.0 | 100 | 6.9 | 0.001 |
