condition mean min max ZT0-3 1217.4499999999998 1217.4499999999998 1217.4499999999998 ZT4-7 758.4 758.4 758.4 ZT8-11 851.45 851.45 851.45 ZT12-15 758.1500000000001 758.1500000000001 758.1500000000001 ZT16-19 1059.8 1059.8 1059.8 ZT20-23 1145.85 1145.85 1145.85