condition mean min max ZT0-3 509.070049 509.070049 509.070049 ZT4-7 451.7435135 451.7435135 451.7435135 ZT8-11 277.43559300000004 277.43559300000004 277.43559300000004 ZT12-15 384.872662 384.872662 384.872662 ZT16-19 286.559206 286.559206 286.559206 ZT20-23 202.25221249999998 202.25221249999998 202.25221249999998