condition mean min max ZT0-3 1.7489065 0.9902995 2.576085 ZT4-7 0.958469 0.958469 0.958469 ZT8-11 4.697725 4.697725 4.697725 ZT12-15 10.1987625 7.707875 12.68965 ZT16-19 6.1564950000000005 6.1564950000000005 6.1564950000000005 ZT20-23 4.560815 4.560815 4.560815