condition mean min max ZT0-3 0.0206328 0.0 0.0412656 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0088086 0.0 0.0176172 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0