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Sialic acid levels in the two groups (Mean±SD, mg/dL)
| Group I | Group Ⅱ | ||||||
| Smokers | Nonsmokers | Total | Smokers | Nonsmokers | Total | ||
| Pleural fluid sialic acid | 64.40±24.01 | 67.21±22.24 | 65.99±22.62 | 79.15±20.03 | 72.97±15.52 | 77.29±18.75 | |
| Serum sialic acid | 73.76±21.87 | 80.04±18.43 | 77.14±20.03 | 81.73±21.95 | 90.20±13.48 | 84.75±20.12 | |
| Ratio | 0.87±0.21 | 0.82±0.12 | 0.84±0.17 | 1.04±0.41 | 0.80±0.19 | 0.96±0.37 | |
