condition mean min max ZT0-3 341.806421 341.806421 341.806421 ZT4-7 92.2540705 92.2540705 92.2540705 ZT8-11 52.592518500000004 52.592518500000004 52.592518500000004 ZT12-15 144.221131 144.221131 144.221131 ZT16-19 176.799576 176.799576 176.799576 ZT20-23 189.68784349999999 189.68784349999999 189.68784349999999