condition mean min max ZT0-3 3.95 3.95 3.95 ZT4-7 3.1 3.1 3.1 ZT8-11 5.5 5.5 5.5 ZT12-15 4.55 4.55 4.55 ZT16-19 0.8500000000000001 0.8500000000000001 0.8500000000000001 ZT20-23 1.8 1.8 1.8