condition mean min max ZT0-3 2969.567532 2312.913132 3626.221932 ZT4-7 5150.4374055 4783.0223305 5517.8524805 ZT8-11 3392.2892155 2598.181755 4186.396676 ZT12-15 1076.8461889 898.08848415 1255.60389365 ZT16-19 1112.64973155 979.1427726 1246.1566905 ZT20-23 1164.4963367750001 978.0979260500001 1350.8947475