condition mean min max ZT0-3 7.7785632985 5.779042864 9.778083733 ZT4-7 20.136132325 19.54709827 20.725166379999997 ZT8-11 39.139258095 27.860009325000004 50.418506865000005 ZT12-15 153.449430555 142.2091681 164.68969301 ZT16-19 110.00014696000001 91.11806647 128.88222745000002 ZT20-23 61.073178825 55.143579165000006 67.002778485