Ụdị ọnụ ụzọ ọkụ na-ekewa n’ime ọnụ ụzọ ọkụ osisi na ọnụ ụzọ ọkụ ígwè. A na-ekewa ha na ọkwa atọ: ọkwa A, ọkwa B na ọkwa C. akara ule atọ ahụ bụ ogologo oge ntachi obi ọkụ. Klas A ụzọ mkpuchi ọkụ, nke nwere ntachi obi ọkụ nke 1.2; Ọnụ ụzọ ọkụ nke klas B, nke nwere ntachi obi ọkụ nke 0.9; Ọnụ ụzọ ọkụ klaasị C, nwere ntachi obi ọkụ nke 0.6.

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