condition mean min max ZT0-3 1656.3000000000002 1656.3000000000002 1656.3000000000002 ZT4-7 872.1 872.1 872.1 ZT8-11 825.1500000000001 825.1500000000001 825.1500000000001 ZT12-15 938.95 938.95 938.95 ZT16-19 1342.5500000000002 1342.5500000000002 1342.5500000000002 ZT20-23 1711.1 1711.1 1711.1