condition mean min max ZT0-3 15.29375 15.03825 15.54925 ZT4-7 26.526049999999998 26.526049999999998 26.526049999999998 ZT8-11 32.891850000000005 32.891850000000005 32.891850000000005 ZT12-15 0 0 0 ZT16-19 20.731650000000002 20.731650000000002 20.731650000000002 ZT20-23 20.4022 20.4022 20.4022