condition mean min max ZT0-3 10.8771275 10.170705 11.583549999999999 ZT4-7 3.83598 3.83598 3.83598 ZT8-11 5.35708 5.35708 5.35708 ZT12-15 0 0 0 ZT16-19 8.30307 8.30307 8.30307 ZT20-23 8.375925 8.375925 8.375925