condition mean min max ZT0-3 7.0193425000000005 6.967890000000001 7.070795 ZT4-7 5.703585 5.703585 5.703585 ZT8-11 8.218815 8.218815 8.218815 ZT12-15 0 0 0 ZT16-19 13.61145 13.61145 13.61145 ZT20-23 9.00909 9.00909 9.00909