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Game da zaɓin tsayin matashin kai, maɓuɓɓuka daban-daban sun ba da shawarwarin nasu, amma gabaɗaya akwai yarjejeniya. Ga manya, tsayin matashin da ya dace yawanci yana tsakanin santimita 8 zuwa 15, tare da shawarar tsayin tsayin santimita 10-15. Musamman:

Gabaɗaya, ga manyan Asiya, ana ba da shawarar tsayin matashin kai kusan santimita 8 zuwa 12

Tsayin matashin kuma na iya bambanta dangane da matsayin barci:

Lokacin kwance, tsayin matashin kai yana da kusan santimita 10-15.

Lokacin kwance a gefe, tsayin matashin ya kamata ya zama mafi girma, kusan santimita 15-20

Ga tsofaffi, tsayin da aka ba da shawarar don matashin kai shine santimita 10 zuwa 15

Lokacin zabar matashin kai, ya kamata kuma a yi la'akari da yanayin jikin mutum da yanayin barci don tabbatar da cewa za'a iya kiyaye yanayin yanayi na kashin mahaifa a lokacin barci, don haka samun sakamako mai dadi da tallafi.