condition mean min max ZT0-3 37.34935 37.34935 37.34935 ZT4-7 27.549300000000002 27.549300000000002 27.549300000000002 ZT8-11 18.88015 18.88015 18.88015 ZT12-15 29.708199999999998 29.708199999999998 29.708199999999998 ZT16-19 33.9726 33.9726 33.9726 ZT20-23 40.3795 40.3795 40.3795