condition mean min max ZT0-3 0.18539783333333335 0.07738300000000001 0.31704 ZT4-7 0.02927465 0.02927465 0.02927465 ZT8-11 0.14837795 0.14837795 0.14837795 ZT12-15 0.47688825 0.42882299999999995 0.5249535000000001 ZT16-19 0.5956635 0.5956635 0.5956635 ZT20-23 0.634843 0.634843 0.634843