condition mean min max ZT0-3 2391.5 2391.5 2391.5 ZT4-7 2230.3 2230.3 2230.3 ZT8-11 2059.0 2059.0 2059.0 ZT12-15 1904.5500000000002 1904.5500000000002 1904.5500000000002 ZT16-19 2174.1499999999996 2174.1499999999996 2174.1499999999996 ZT20-23 2304.3500000000004 2304.3500000000004 2304.3500000000004