condition mean min max ZT0-3 18.05 18.05 18.05 ZT4-7 2.3 2.3 2.3 ZT8-11 10.8 10.8 10.8 ZT12-15 3.15 3.15 3.15 ZT16-19 9.6 9.6 9.6 ZT20-23 21.799999999999997 21.799999999999997 21.799999999999997