condition mean min max ZT0-3 1.75 1.75 1.75 ZT4-7 1.3 1.3 1.3 ZT8-11 13.75 13.75 13.75 ZT12-15 2.3 2.3 2.3 ZT16-19 3.55 3.55 3.55 ZT20-23 7.3999999999999995 7.3999999999999995 7.3999999999999995