condition mean min max ZT0-3 0.5385236666666666 0.2238355 0.814031 ZT4-7 0.7622215 0.7622215 0.7622215 ZT8-11 0.357341 0.357341 0.357341 ZT12-15 2.0676525000000003 1.61958 2.515725 ZT16-19 1.641568 1.641568 1.641568 ZT20-23 0.9187955000000001 0.9187955000000001 0.9187955000000001