condition mean min max ZT0-3 8.846114811 5.6456918620000005 12.04653776 ZT4-7 41.1806913825 27.42777555 54.933607214999995 ZT8-11 128.86795604 93.95164113 163.78427095 ZT12-15 287.12198525 277.1962634 297.0477071 ZT16-19 188.20957135000003 177.6046934 198.81444930000004 ZT20-23 131.18656965 122.12692999999999 140.2462093