condition mean min max ZT0-3 17.8488 16.04195 19.65565 ZT4-7 13.17905 13.17905 13.17905 ZT8-11 7.201835 7.201835 7.201835 ZT12-15 0 0 0 ZT16-19 11.24013 11.24013 11.24013 ZT20-23 15.580549999999999 15.580549999999999 15.580549999999999