condition mean min max ZT0-3 2.17561 2.17561 2.17561 ZT4-7 1.3393950000000001 1.3393950000000001 1.3393950000000001 ZT8-11 2.358455 2.358455 2.358455 ZT12-15 4.6352150000000005 4.6352150000000005 4.6352150000000005 ZT16-19 4.13976 4.13976 4.13976 ZT20-23 3.17977 3.17977 3.17977