condition mean min max ZT0-3 1.15 1.15 1.15 ZT4-7 1.3 1.3 1.3 ZT8-11 2.7 2.7 2.7 ZT12-15 1.7000000000000002 1.7000000000000002 1.7000000000000002 ZT16-19 4.75 4.75 4.75 ZT20-23 1.4 1.4 1.4