condition mean min max ZT0-3 0.29883468275 0.22532516549999998 0.3723442 ZT4-7 0.33309699625 0.2042349035 0.461959089 ZT8-11 0.59034463975 0.5689040825 0.6117851969999999 ZT12-15 0.45876376249999995 0.33299340499999996 0.5845341199999999 ZT16-19 1.08756865425 0.698606113 1.4765311955000002 ZT20-23 2.34147902175 1.6926809999999999 2.9902770435000003