condition mean min max ZT0-3 28.278950000000002 28.278950000000002 28.278950000000002 ZT4-7 22.241950000000003 22.241950000000003 22.241950000000003 ZT8-11 21.127 21.127 21.127 ZT12-15 23.96015 23.96015 23.96015 ZT16-19 27.739449999999998 27.739449999999998 27.739449999999998 ZT20-23 28.307650000000002 28.307650000000002 28.307650000000002