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| Group | Lung zones |
Mean | ||
| Upper | Middle | Lower | ||
| Seropositive patients | 17.3 | 20.3 | 17.3 | 17.9 |
| Seronegative patients | 17.1 | 17.2 | 16.2 | 15.9 |
Values given in the table are the mean number of small nodules and micronodules in two contiguous 4 cm2 squares on selected levels.
