condition mean min max ZT0-3 6.8999999999999995 6.8999999999999995 6.8999999999999995 ZT4-7 1.2 1.2 1.2 ZT8-11 25.75 25.75 25.75 ZT12-15 22.5 22.5 22.5 ZT16-19 11.6 11.6 11.6 ZT20-23 19.35 19.35 19.35