condition mean min max ZT0-3 2.36057 1.66064 2.7604550000000003 ZT4-7 1.812055 1.812055 1.812055 ZT8-11 2.540805 2.540805 2.540805 ZT12-15 3.5025225 3.033835 3.97121 ZT16-19 3.2321150000000003 3.2321150000000003 3.2321150000000003 ZT20-23 4.1573 4.1573 4.1573