condition mean min max ZT0-3 386.778111 386.778111 386.778111 ZT4-7 403.304396 403.304396 403.304396 ZT8-11 410.538715 410.538715 410.538715 ZT12-15 450.589528 450.589528 450.589528 ZT16-19 496.9952995 496.9952995 496.9952995 ZT20-23 436.565397 436.565397 436.565397