condition mean min max ZT0-3 32.1469631075 26.809855964999997 37.48407025 ZT4-7 18.0481862075 15.488002394999999 20.60837002 ZT8-11 27.42457631 23.48851035 31.36064227 ZT12-15 21.3774851325 19.89558025 22.859390015 ZT16-19 18.837796455 15.254770624999999 22.420822285 ZT20-23 31.988127565 28.63012162 35.34613351