condition mean min max ZT0-3 47.56611 47.56611 47.56611 ZT4-7 28.530365500000002 28.530365500000002 28.530365500000002 ZT8-11 20.6038135 20.6038135 20.6038135 ZT12-15 26.753613 26.753613 26.753613 ZT16-19 19.800620000000002 19.800620000000002 19.800620000000002 ZT20-23 23.524964 23.524964 23.524964