condition mean min max ZT0-3 3.5199508357500005 2.2207770815 4.81912459 ZT4-7 0.32757083725 0.16717061449999998 0.48797106 ZT8-11 2.498536213 0.0617161665 4.9353562595 ZT12-15 31.055718926750004 30.8416282985 31.269809555000002 ZT16-19 29.312733915000003 27.07717772 31.54829011 ZT20-23 20.232625784999996 19.912228139999996 20.55302343