condition mean min max ZT0-3 183.235011 183.235011 183.235011 ZT4-7 141.370425 141.370425 141.370425 ZT8-11 154.4251015 154.4251015 154.4251015 ZT12-15 153.099333 153.099333 153.099333 ZT16-19 198.401655 198.401655 198.401655 ZT20-23 231.73483099999999 231.73483099999999 231.73483099999999