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 0.04468035 0.04468035 0.04468035 ZT16-19 0.03961735 0.03961735 0.03961735 ZT20-23 0.0387962 0.0387962 0.0387962