condition mean min max ZT0-3 614.908916 614.908916 614.908916 ZT4-7 484.3045495 484.3045495 484.3045495 ZT8-11 528.0789635 528.0789635 528.0789635 ZT12-15 574.4155595 574.4155595 574.4155595 ZT16-19 653.1161645 653.1161645 653.1161645 ZT20-23 701.912288 701.912288 701.912288