condition mean min max ZT0-3 4.8175325967500005 4.574055907 5.0610092865 ZT4-7 10.71928297025 9.4330967855 12.005469155 ZT8-11 18.631024965 15.34070101 21.92134892 ZT12-15 23.6615846075 22.43870465 24.884464565000002 ZT16-19 19.063174529999998 18.284553485 19.841795575 ZT20-23 14.0562220025 13.46996429 14.642479715