condition mean min max ZT0-3 0.0253309 0.0 0.03969545 ZT4-7 0.0718505 0.0718505 0.0718505 ZT8-11 0.0 0.0 0.0 ZT12-15 0.017755425 0.0 0.03551085 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0