condition mean min max ZT0-3 0.2179535 0.1103815 0.361013 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.3433625 0.0 0.686725 ZT16-19 0.0 0.0 0.0 ZT20-23 0.576795 0.576795 0.576795