condition mean min max ZT0-3 606.796562 606.796562 606.796562 ZT4-7 577.9097265 577.9097265 577.9097265 ZT8-11 621.5298965 621.5298965 621.5298965 ZT12-15 733.1647645 733.1647645 733.1647645 ZT16-19 773.9324730000001 773.9324730000001 773.9324730000001 ZT20-23 923.925587 923.925587 923.925587