condition mean min max ZT0-3 42.215804 42.215804 42.215804 ZT4-7 333.06699199999997 333.06699199999997 333.06699199999997 ZT8-11 423.094778 423.094778 423.094778 ZT12-15 214.9221505 214.9221505 214.9221505 ZT16-19 76.71106400000001 76.71106400000001 76.71106400000001 ZT20-23 27.6187245 27.6187245 27.6187245