condition mean min max ZT0-3 3.5500000000000003 3.5500000000000003 3.5500000000000003 ZT4-7 15.8 15.8 15.8 ZT8-11 3.5 3.5 3.5 ZT12-15 9.25 9.25 9.25 ZT16-19 4.0 4.0 4.0 ZT20-23 1.2 1.2 1.2