condition mean min max ZT0-3 985.067823 985.067823 985.067823 ZT4-7 846.037385 846.037385 846.037385 ZT8-11 918.2650805000001 918.2650805000001 918.2650805000001 ZT12-15 1065.8690005 1065.8690005 1065.8690005 ZT16-19 1453.564448 1453.564448 1453.564448 ZT20-23 1397.354102 1397.354102 1397.354102