condition mean min max ZT0-3 1070.688917 1070.688917 1070.688917 ZT4-7 1677.3132315 1677.3132315 1677.3132315 ZT8-11 1781.1711540000001 1781.1711540000001 1781.1711540000001 ZT12-15 3917.1871815 3917.1871815 3917.1871815 ZT16-19 2915.6935949999997 2915.6935949999997 2915.6935949999997 ZT20-23 3041.0974415 3041.0974415 3041.0974415