condition mean min max ZT0-3 0.8318075 0.8318075 0.8318075 ZT4-7 0.4568275 0.4568275 0.4568275 ZT8-11 0.4407895 0.4407895 0.4407895 ZT12-15 0.6271685 0.6271685 0.6271685 ZT16-19 1.678305 1.678305 1.678305 ZT20-23 0.8124104999999999 0.8124104999999999 0.8124104999999999