condition mean min max ZT0-3 0.03680620816666667 0.0 0.07361241633333333 ZT4-7 0.008091419 0.0 0.016182838 ZT8-11 0.0 0.0 0.0 ZT12-15 0.012408810499999999 0.0 0.024817620999999998 ZT16-19 0.0 0.0 0.0 ZT20-23 0.010968507333333334 0.0 0.021937014666666668