condition mean min max ZT0-3 30.4098 30.4098 30.4098 ZT4-7 27.7999 27.7999 27.7999 ZT8-11 20.524900000000002 20.524900000000002 20.524900000000002 ZT12-15 19.62385 19.62385 19.62385 ZT16-19 19.913 19.913 19.913 ZT20-23 31.86765 31.86765 31.86765