Table 1.
Characteristics of the abstracts used as input to the classification process
| Category | Biased abstracts | Unbiased abstracts | All abstracts |
|---|---|---|---|
| Relevant | 145 | 2 | 147 |
| Irrelevant | 231 | 133 | 364 |
| Total | 376 | 135 | 511 |
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