condition mean min max ZT0-3 290.8876666666667 215.947 383.8995 ZT4-7 202.145 202.145 202.145 ZT8-11 648.9335000000001 648.9335000000001 648.9335000000001 ZT12-15 441.66525 387.5585 495.77200000000005 ZT16-19 211.3175 211.3175 211.3175 ZT20-23 192.479 192.479 192.479