condition mean min max ZT0-3 0.8344851666666667 0.625583 0.9691160000000001 ZT4-7 0.582812 0.582812 0.582812 ZT8-11 0.9657469999999999 0.9657469999999999 0.9657469999999999 ZT12-15 2.36331 2.14483 2.58179 ZT16-19 2.81075 2.81075 2.81075 ZT20-23 2.52968 2.52968 2.52968