condition mean min max ZT0-3 59.184937 59.184937 59.184937 ZT4-7 119.432357 119.432357 119.432357 ZT8-11 177.4470435 177.4470435 177.4470435 ZT12-15 219.83306950000002 219.83306950000002 219.83306950000002 ZT16-19 163.57514700000002 163.57514700000002 163.57514700000002 ZT20-23 203.5072945 203.5072945 203.5072945