condition mean min max ZT0-3 24.2 24.2 24.2 ZT4-7 3.7 3.7 3.7 ZT8-11 14.799999999999999 14.799999999999999 14.799999999999999 ZT12-15 2.5 2.5 2.5 ZT16-19 8.25 8.25 8.25 ZT20-23 11.75 11.75 11.75