Table 4. Efficiency scores and returns to scale of dibiteries.
| Efficiency score | Total efficiency | Pure technical efficiency | Scale efficiency |
|---|---|---|---|
| Means | 0.74 * | 0.89 * | 0.83 |
| Standard deviation | 0.2 | 0.15 | 0.15 |
| Minimum | 0.316 | 0.523 | 0.33 |
| Maximum | 1 | 1 | 1 |
| Number of dibiteries | 152 | 152 | 152 |
| Number of efficient dibiteries | 31 | 79 | 31 |
| Number of inefficient dibiteries | 121 | 73 | 121 |
| RS | Percentage of dibiteries (%) | ||
| Increasing (IRS) | 78.3 | ||
| Constant (CRS) | 20.4 | ||
| Decreasing (DRS) | 1.3 | ||
| Total | 100.0 | ||
*Significant difference at p < 0.05 (Student’s t-test).