condition mean min max ZT0-3 6.81560968275 6.210518137999999 7.4207012275 ZT4-7 2.06184367825 1.5126073334999999 2.611080023 ZT8-11 3.9446760375 2.627646461 5.261705613999999 ZT12-15 5.559720081 5.1057446754999996 6.0136954865 ZT16-19 3.7990479885 3.2756894395 4.3224065375 ZT20-23 7.05252655125 6.807559121 7.2974939815