condition mean min max ZT0-3 2.29192140575 1.4002999004999999 3.1835429110000004 ZT4-7 1.5101577107500002 0.7756706645 2.244644757 ZT8-11 3.6634066314999996 3.1296035274999996 4.1972097354999995 ZT12-15 1.7121990114999999 1.490865189 1.9335328339999998 ZT16-19 1.5808427015 1.2157840219999998 1.945901381 ZT20-23 1.289564742 1.0708453935 1.5082840905000001