Amapadire y'ijoro 420mm

410mm bivuga uburebure bw'umutwe w'ipadire, ku buryo buhagije bukomeye ugereranyije n'amasaha y'umunsi 240-290mm n'amasaha y'ijoro asanzwe y'imyaka 330mm. Uruhare rwawo rukomeye, rushobora guhura n'umurongo w'igitugu cy'umuntu, bikorwa by'ijoro byo kuhindura, guhagarara, n'ibindi bikorwa byinshi, kugabanya ingaruka z'ibyago byo kujya mu maboko, no gukemura ibibazo byo kujya mu maboko by'ijoro.