condition mean min max ZT0-3 2.35687675125 1.395035658 3.3187178445 ZT4-7 3.9887531989999996 2.8811959865 5.096310411499999 ZT8-11 0.8335421685000001 0.7277818035000001 0.9393025335 ZT12-15 3.5200598942499997 2.7451694095 4.294950378999999 ZT16-19 6.86924396175 5.288630596499999 8.449857327 ZT20-23 26.0575526425 12.519254055000001 39.59585123