condition mean min max ZT0-3 0.8086783333333333 0.492629 0.971071 ZT4-7 0.263129 0.263129 0.263129 ZT8-11 0.18515399999999999 0.18515399999999999 0.18515399999999999 ZT12-15 0.41575599999999996 0.184306 0.647206 ZT16-19 0.5916075 0.5916075 0.5916075 ZT20-23 1.1126385 1.1126385 1.1126385