condition mean min max ZT0-3 2.25 2.25 2.25 ZT4-7 1.2 1.2 1.2 ZT8-11 3.95 3.95 3.95 ZT12-15 2.55 2.55 2.55 ZT16-19 2.25 2.25 2.25 ZT20-23 2.9000000000000004 2.9000000000000004 2.9000000000000004