condition mean min max ZT0-3 1.25 1.25 1.25 ZT4-7 3.0 3.0 3.0 ZT8-11 2.35 2.35 2.35 ZT12-15 13.85 13.85 13.85 ZT16-19 5.05 5.05 5.05 ZT20-23 1.7000000000000002 1.7000000000000002 1.7000000000000002