condition mean min max ZT0-3 1.8211499999999998 1.8211499999999998 1.8211499999999998 ZT4-7 1.0397225 1.0397225 1.0397225 ZT8-11 1.82118 1.82118 1.82118 ZT12-15 2.26437 2.26437 2.26437 ZT16-19 2.678185 2.678185 2.678185 ZT20-23 2.264815 2.264815 2.264815