condition mean min max ZT0-3 4.5428225 4.320715 4.76493 ZT4-7 3.38236 3.38236 3.38236 ZT8-11 13.77725 13.77725 13.77725 ZT12-15 0 0 0 ZT16-19 11.69384 11.69384 11.69384 ZT20-23 7.691974999999999 7.691974999999999 7.691974999999999