A na-ekewa ọkwa nkwụsị ọkụ nke ọnụ ụzọ ọkụ ígwè n’ime ụdị atọ. Oge nkwụsị ọkụ nke Klas A nchara ọkụ ọnụ ụzọ agaghị erughị awa 1.5; oge nkwụsị ọkụ nke klas B ígwè ọkụ ọnụ ụzọ agaghị erughị awa 1.0; oge nkwụsị ọkụ nke klas C ígwè ọkụ ọnụ ụzọ agaghị erughị awa 0.5.

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