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. 2023 Dec 2;10(1):e22850. doi: 10.1016/j.heliyon.2023.e22850

Table 5.

Efficiency Levels Categorization (2015 vs. 2021).

Efficiency Level 2015 2021
High 9 6
Medium-High 11 14
Medium-Low 14 13
Low 8 9