condition mean min max ZT0-3 1.9444 1.9444 1.9444 ZT4-7 1.385755 1.385755 1.385755 ZT8-11 1.271875 1.271875 1.271875 ZT12-15 1.441925 1.441925 1.441925 ZT16-19 4.0614550000000005 4.0614550000000005 4.0614550000000005 ZT20-23 2.49861 2.49861 2.49861