condition mean min max ZT0-3 3.3853080867500003 1.783312419 4.9873037545 ZT4-7 6.1941427935 5.1712241195 7.217061467500001 ZT8-11 17.9956668305 13.161756391 22.82957727 ZT12-15 33.87453848 33.01163012 34.737446840000004 ZT16-19 32.8364988075 31.250736865 34.42226075 ZT20-23 30.1128599625 28.534268140000002 31.691451784999998