condition mean min max ZT0-3 0.6789784999999999 0.6789784999999999 0.6789784999999999 ZT4-7 0.565469 0.565469 0.565469 ZT8-11 0.8052330000000001 0.8052330000000001 0.8052330000000001 ZT12-15 1.8316459999999999 1.8316459999999999 1.8316459999999999 ZT16-19 1.362265 1.362265 1.362265 ZT20-23 1.176174 1.176174 1.176174