condition mean min max ZT0-3 1.8360349999999999 1.8360349999999999 1.8360349999999999 ZT4-7 2.141755 2.141755 2.141755 ZT8-11 1.629915 1.629915 1.629915 ZT12-15 1.371925 1.371925 1.371925 ZT16-19 1.76032 1.76032 1.76032 ZT20-23 1.184815 1.184815 1.184815