condition mean min max ZT0-3 5.0 5.0 5.0 ZT4-7 2.0 2.0 2.0 ZT8-11 13.549999999999999 13.549999999999999 13.549999999999999 ZT12-15 1.2000000000000002 1.2000000000000002 1.2000000000000002 ZT16-19 4.15 4.15 4.15 ZT20-23 3.55 3.55 3.55