condition mean min max ZT0-3 17.020075 15.343799999999998 18.696350000000002 ZT4-7 5.010755 5.010755 5.010755 ZT8-11 10.94102 10.94102 10.94102 ZT12-15 0 0 0 ZT16-19 35.67955 35.67955 35.67955 ZT20-23 18.7333 18.7333 18.7333