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Causes of hospitalization among inpatient cases of SSc
| Cause of hospitalization | ICD9-CM | Frequency | % |
|---|---|---|---|
| Diseases of the circulatory system | 390–459 | 242 | 35.2 |
| Diseases of the respiratory system | 460–519 | 152 | 22.1 |
| Diseases of the digestive system | 520–579 | 124 | 18.0 |
| Diseases of the skin and subcutaneous tissue | 680–709 | 83 | 12.1 |
| Malignant neoplasms | 140–209, 230–239 | 79 | 11.5 |
