condition mean min max ZT0-3 2.9000000000000004 2.9000000000000004 2.9000000000000004 ZT4-7 2.4 2.4 2.4 ZT8-11 20.5 20.5 20.5 ZT12-15 3.05 3.05 3.05 ZT16-19 4.800000000000001 4.800000000000001 4.800000000000001 ZT20-23 4.949999999999999 4.949999999999999 4.949999999999999