condition mean min max ZT0-3 0.0383053205 0.0 0.076610641 ZT4-7 0.0219891675 0.0 0.043978335 ZT8-11 0.027572968499999996 0.026706976999999996 0.02843896 ZT12-15 0.0120976485 0.0 0.024195297 ZT16-19 0.0 0.0 0.0 ZT20-23 0.010727739666666666 0.0 0.021455479333333333