condition mean min max ZT0-3 4.6807 4.6807 4.6807 ZT4-7 3.777975 3.777975 3.777975 ZT8-11 2.95946 2.95946 2.95946 ZT12-15 5.63583 5.63583 5.63583 ZT16-19 6.000064999999999 6.000064999999999 6.000064999999999 ZT20-23 4.18313 4.18313 4.18313