condition mean min max ZT0-3 20.660125 19.4665 21.853749999999998 ZT4-7 25.1819 25.1819 25.1819 ZT8-11 28.636400000000002 28.636400000000002 28.636400000000002 ZT12-15 0 0 0 ZT16-19 37.5248 37.5248 37.5248 ZT20-23 27.359299999999998 27.359299999999998 27.359299999999998