condition mean min max ZT0-3 33.32568333333333 21.84765 53.2987 ZT4-7 14.870450000000002 14.870450000000002 14.870450000000002 ZT8-11 9.616485 9.616485 9.616485 ZT12-15 20.9615325 9.628765 32.2943 ZT16-19 19.5803 19.5803 19.5803 ZT20-23 18.74675 18.74675 18.74675