Table 3 Measurements of birefringent particles or fibers found on BAL slides using polarized light microscopy shown as percentages of particles by greatest dimension (< 6 m or > 6 m) and all fibers having > 3:1 aspect ratio and parallel sides
| Â | Talc | Â | Days after instillation | Â | Granite | Â |
|---|---|---|---|---|---|---|
<  6 μm | 6 or > μm | Fibers |  | <  6 μm | 6 or > μm | Fibers |
93% | 3% | 4% | 1 | 100% | 0 | 0 |
95% | 2.5% | 2.5% | 4 | 100% | 0 | 0 |
92% | 3.7% | 4.3% | 7 | 99% | 1% | 0 |
93% | 2% | 5% | 14 | 99% | 1% | 0 |