condition mean min max ZT0-3 21.85 21.85 21.85 ZT4-7 2.8 2.8 2.8 ZT8-11 10.799999999999999 10.799999999999999 10.799999999999999 ZT12-15 1.95 1.95 1.95 ZT16-19 11.75 11.75 11.75 ZT20-23 8.65 8.65 8.65