condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.063837595 0.051746632 0.075928558 ZT12-15 0.11157296625 0.052868367 0.1702775655 ZT16-19 0.04570995225 0.0 0.0914199045 ZT20-23 0.0 0.0 0.0