condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.021731494166666667 0.0 0.043462988333333334 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0227019435 0.0 0.045403887 ZT20-23 0.0 0.0 0.0