condition mean min max ZT0-3 1.9959888333333333 0.9073665000000001 3.331345 ZT4-7 1.447365 1.447365 1.447365 ZT8-11 0.4165325 0.4165325 0.4165325 ZT12-15 0.10088385 0.0559325 0.1458352 ZT16-19 0.1626005 0.1626005 0.1626005 ZT20-23 0.14317950000000002 0.14317950000000002 0.14317950000000002