condition mean min max ZT0-3 0.38408021974999995 0.3417930855 0.426367354 ZT4-7 0.0791116035 0.032538566 0.125684641 ZT8-11 5.8001219255 0.252264831 11.34797902 ZT12-15 28.24413807 22.698072105 33.790204035 ZT16-19 14.3624548735 10.898936347 17.825973400000002 ZT20-23 3.600317993 1.8700929524999998 5.3305430335