condition mean min max ZT0-3 2.55 2.55 2.55 ZT4-7 1.9 1.9 1.9 ZT8-11 12.549999999999999 12.549999999999999 12.549999999999999 ZT12-15 3.05 3.05 3.05 ZT16-19 1.3 1.3 1.3 ZT20-23 10.200000000000001 10.200000000000001 10.200000000000001