condition mean min max ZT0-3 5.83652 5.100099999999999 6.57294 ZT4-7 4.975535 4.975535 4.975535 ZT8-11 3.843705 3.843705 3.843705 ZT12-15 0 0 0 ZT16-19 7.56945 7.56945 7.56945 ZT20-23 8.8239 8.8239 8.8239