condition mean min max ZT0-3 8.673000000000002 7.796435000000001 9.549565000000001 ZT4-7 25.3222 25.3222 25.3222 ZT8-11 30.84285 30.84285 30.84285 ZT12-15 0 0 0 ZT16-19 13.969850000000001 13.969850000000001 13.969850000000001 ZT20-23 19.5123 19.5123 19.5123