condition mean min max ZT0-3 1673.703621 1673.703621 1673.703621 ZT4-7 2402.4004575 2402.4004575 2402.4004575 ZT8-11 2153.732341 2153.732341 2153.732341 ZT12-15 2573.3909575 2573.3909575 2573.3909575 ZT16-19 1837.5529065 1837.5529065 1837.5529065 ZT20-23 1497.379614 1497.379614 1497.379614