condition mean min max ZT0-3 9.386524999999999 9.386524999999999 9.386524999999999 ZT4-7 7.8199 7.8199 7.8199 ZT8-11 5.978105 5.978105 5.978105 ZT12-15 7.762255 7.762255 7.762255 ZT16-19 9.97206 9.97206 9.97206 ZT20-23 9.30866 9.30866 9.30866