condition mean min max ZT0-3 26.37 26.37 26.37 ZT4-7 32.47444444333333 32.47444444333333 32.47444444333333 ZT8-11 24.957222220000002 24.957222220000002 24.957222220000002 ZT12-15 21.402222223333332 21.402222223333332 21.402222223333332 ZT16-19 27.44777778 27.44777778 27.44777778 ZT20-23 24.80777778 24.80777778 24.80777778