condition mean min max ZT0-3 0.5535917925 0.35994831899999996 0.747235266 ZT4-7 1.40118111275 1.314740459 1.4876217665 ZT8-11 1.5972143835000001 1.5588066265 1.6356221405000002 ZT12-15 4.601063006 3.051325093 6.150800919 ZT16-19 5.02846570275 4.4779087825 5.579022623 ZT20-23 8.15390618875 7.412861226 8.894951151499999