condition mean min max ZT0-3 273.13166666666666 243.38299999999998 318.01300000000003 ZT4-7 166.711 166.711 166.711 ZT8-11 61.11855 61.11855 61.11855 ZT12-15 81.62899999999999 75.21934999999999 88.03864999999999 ZT16-19 97.31389999999999 97.31389999999999 97.31389999999999 ZT20-23 206.125 206.125 206.125