Table 2.
Distribution of qualitative background enhancement.
| BPE | n | % |
|---|---|---|
| 1 | 46 | 19.83 |
| 2 | 105 | 44.30 |
| 3 | 52 | 21.94 |
| 4 | 32 | 13.92 |
| All | 235 |
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