condition mean min max ZT0-3 15.9903 13.761050000000001 18.219549999999998 ZT4-7 11.64595 11.64595 11.64595 ZT8-11 18.67905 18.67905 18.67905 ZT12-15 0 0 0 ZT16-19 22.7265 22.7265 22.7265 ZT20-23 19.560499999999998 19.560499999999998 19.560499999999998