condition mean min max ZT0-3 274.588056 274.588056 274.588056 ZT4-7 430.64475400000003 430.64475400000003 430.64475400000003 ZT8-11 617.998024 617.998024 617.998024 ZT12-15 785.5793880000001 785.5793880000001 785.5793880000001 ZT16-19 668.5867390000001 668.5867390000001 668.5867390000001 ZT20-23 637.4902985 637.4902985 637.4902985