condition mean min max ZT0-3 180.585244 180.585244 180.585244 ZT4-7 161.4526705 161.4526705 161.4526705 ZT8-11 164.930477 164.930477 164.930477 ZT12-15 114.286145 114.286145 114.286145 ZT16-19 101.283576 101.283576 101.283576 ZT20-23 90.5537585 90.5537585 90.5537585