condition mean min max ZT0-3 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT4-7 2.2 2.2 2.2 ZT8-11 13.0 13.0 13.0 ZT12-15 2.25 2.25 2.25 ZT16-19 1.15 1.15 1.15 ZT20-23 2.55 2.55 2.55