condition mean min max ZT0-3 986.409725 986.409725 986.409725 ZT4-7 1919.4340554999999 1919.4340554999999 1919.4340554999999 ZT8-11 1709.801367 1709.801367 1709.801367 ZT12-15 1653.1739545 1653.1739545 1653.1739545 ZT16-19 1233.0546115 1233.0546115 1233.0546115 ZT20-23 1094.6254865 1094.6254865 1094.6254865