condition mean min max ZT0-3 3.35 3.35 3.35 ZT4-7 1.5 1.5 1.5 ZT8-11 5.95 5.95 5.95 ZT12-15 1.7000000000000002 1.7000000000000002 1.7000000000000002 ZT16-19 3.1 3.1 3.1 ZT20-23 12.05 12.05 12.05