condition mean min max ZT0-3 716.295147 716.295147 716.295147 ZT4-7 518.6608974999999 518.6608974999999 518.6608974999999 ZT8-11 476.78715450000004 476.78715450000004 476.78715450000004 ZT12-15 616.828992 616.828992 616.828992 ZT16-19 606.705737 606.705737 606.705737 ZT20-23 380.6586695 380.6586695 380.6586695