condition mean min max ZT0-3 1.0379070000000001 1.0379070000000001 1.0379070000000001 ZT4-7 0.6251893333333334 0.6251893333333334 0.6251893333333334 ZT8-11 0.5068908 0.5068908 0.5068908 ZT12-15 0.263777 0.263777 0.263777 ZT16-19 0.7842250000000001 0.7842250000000001 0.7842250000000001 ZT20-23 0.493534 0.493534 0.493534