condition mean min max ZT0-3 2921.882772 2921.882772 2921.882772 ZT4-7 2596.385401 2596.385401 2596.385401 ZT8-11 2709.6506090000003 2709.6506090000003 2709.6506090000003 ZT12-15 3168.800719 3168.800719 3168.800719 ZT16-19 2486.6636385 2486.6636385 2486.6636385 ZT20-23 2054.9728805 2054.9728805 2054.9728805