condition mean min max ZT0-3 9.408760000000001 5.42722 13.3903 ZT4-7 17.7774 17.7774 17.7774 ZT8-11 13.489075 13.489075 13.489075 ZT12-15 0 0 0 ZT16-19 33.34205 33.34205 33.34205 ZT20-23 9.39068 9.39068 9.39068