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 0.0 0.0 0.0 ZT16-19 0.01870209266666667 0.017812624000000003 0.019591561333333334 ZT20-23 0.0 0.0 0.0