condition mean min max ZT0-3 0.22767308274999998 0.0 0.45534616549999996 ZT4-7 2.9227820652500003 2.3790834370000002 3.4664806935000003 ZT8-11 6.742379304250001 5.334139952 8.1506186565 ZT12-15 14.044312979999999 11.795899904999999 16.292726055 ZT16-19 18.2368080425 17.84135852 18.632257565 ZT20-23 17.039281527500002 16.857056280000002 17.221506775