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Patient characteristics
| Group I | Group II | Group III | Group IV | Group V | |
|---|---|---|---|---|---|
| N | 38 | 15 | 42 | 19 | 9 |
| Median age (yr) | 7 | 5 | 4 | 5 | 5 |
| Sex (M:F) | 21:17 | 9:6 | 25:17 | 11:8 | 4:5 |
Group I: general MP pneumonia; Group II: refractory MP pneumonia; Group III: general MP pneumonia + viral pneumonia; Group IV: viral pneumonia; Group V: control
