condition mean min max ZT0-3 45.54875 36.9493 52.189949999999996 ZT4-7 25.7845 25.7845 25.7845 ZT8-11 12.552499999999998 12.552499999999998 12.552499999999998 ZT12-15 20.547475 15.8914 25.20355 ZT16-19 16.03155 16.03155 16.03155 ZT20-23 35.58895 35.58895 35.58895