condition mean min max ZT0-3 1.3373351494999999 0.807095386 1.867574913 ZT4-7 3.2529135905 3.072535156 3.433292025 ZT8-11 2.01662158675 1.740651589 2.2925915845 ZT12-15 3.3178733017499997 2.919858461 3.7158881425 ZT16-19 3.575505808 3.564126625 3.5868849910000002 ZT20-23 3.1377401415 2.627129798 3.648350485