condition mean min max ZT0-3 24.912100000000002 24.912100000000002 24.912100000000002 ZT4-7 24.3765 24.3765 24.3765 ZT8-11 19.292949999999998 19.292949999999998 19.292949999999998 ZT12-15 18.40435 18.40435 18.40435 ZT16-19 22.420250000000003 22.420250000000003 22.420250000000003 ZT20-23 23.15115 23.15115 23.15115