condition mean min max ZT0-3 311.385903 311.385903 311.385903 ZT4-7 275.680095 275.680095 275.680095 ZT8-11 261.0750545 261.0750545 261.0750545 ZT12-15 317.11883350000005 317.11883350000005 317.11883350000005 ZT16-19 323.60382949999996 323.60382949999996 323.60382949999996 ZT20-23 281.73718199999996 281.73718199999996 281.73718199999996