condition mean min max ZT0-3 1.8655925 1.62113 2.110055 ZT4-7 1.628075 1.628075 1.628075 ZT8-11 0.8630055 0.8630055 0.8630055 ZT12-15 0 0 0 ZT16-19 1.342735 1.342735 1.342735 ZT20-23 1.85298 1.85298 1.85298