condition mean min max ZT0-3 626.371239 626.371239 626.371239 ZT4-7 1389.876344 1389.876344 1389.876344 ZT8-11 567.8773735 567.8773735 567.8773735 ZT12-15 612.8198825 612.8198825 612.8198825 ZT16-19 754.2142635 754.2142635 754.2142635 ZT20-23 1652.518165 1652.518165 1652.518165