condition mean min max ZT0-3 464.20000000000005 464.20000000000005 464.20000000000005 ZT4-7 641.5 641.5 641.5 ZT8-11 759.25 759.25 759.25 ZT12-15 763.05 763.05 763.05 ZT16-19 622.55 622.55 622.55 ZT20-23 555.95 555.95 555.95