condition mean min max ZT0-3 0.362646 0.362646 0.362646 ZT4-7 0.1870595 0.1870595 0.1870595 ZT8-11 0.2414635 0.2414635 0.2414635 ZT12-15 4.29732 4.29732 4.29732 ZT16-19 2.5561949999999998 2.5561949999999998 2.5561949999999998 ZT20-23 0.8508295 0.8508295 0.8508295