condition mean min max ZT0-3 38.6135601175 38.4354571 38.791663135 ZT4-7 31.8651603075 31.471539 32.258781615 ZT8-11 34.5910785875 30.165022965 39.01713421 ZT12-15 46.0549393525 43.35742083 48.752457875000005 ZT16-19 61.1944159175 58.48874748 63.900084355000004 ZT20-23 47.388646365 45.424245514999996 49.353047215000004