condition mean min max ZT0-3 0.496314 0.496314 0.496314 ZT4-7 0.5637515 0.5637515 0.5637515 ZT8-11 0.789404 0.789404 0.789404 ZT12-15 0.3935015 0.3935015 0.3935015 ZT16-19 0.19262800000000002 0.19262800000000002 0.19262800000000002 ZT20-23 0.38397200000000004 0.38397200000000004 0.38397200000000004