condition mean min max ZT0-3 7.0 7.0 7.0 ZT4-7 2.3 2.3 2.3 ZT8-11 1.25 1.25 1.25 ZT12-15 1.65 1.65 1.65 ZT16-19 0.8999999999999999 0.8999999999999999 0.8999999999999999 ZT20-23 3.55 3.55 3.55