condition mean min max ZT0-3 6.18815318475 6.0092205475 6.367085822000001 ZT4-7 5.856109558 5.100886616 6.6113325 ZT8-11 5.924883385749999 5.9130156645 5.936751106999999 ZT12-15 9.841164498 7.425583222499999 12.2567457735 ZT16-19 16.1444524925 14.03806299 18.250841995000002 ZT20-23 23.567102407500002 21.139094695 25.99511012