condition mean min max ZT0-3 11635.45 11635.45 11635.45 ZT4-7 7164.0 7164.0 7164.0 ZT8-11 7706.200000000001 7706.200000000001 7706.200000000001 ZT12-15 6425.299999999999 6425.299999999999 6425.299999999999 ZT16-19 9014.85 9014.85 9014.85 ZT20-23 11044.05 11044.05 11044.05