condition mean min max ZT0-3 4.31922467825 3.706865034 4.9315843225 ZT4-7 5.9601126775 5.5734648605 6.3467604945 ZT8-11 10.175890981250001 8.527284381000001 11.824497581500001 ZT12-15 14.227231407500001 12.389179890000001 16.065282925 ZT16-19 11.10061823725 10.1029188545 12.09831762 ZT20-23 10.56056486675 9.7685601785 11.352569554999999