condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0125869665 0.0 0.025173933 ZT16-19 0.0 0.0 0.0 ZT20-23 0.011777719833333334 0.0 0.023555439666666667