condition mean min max ZT0-3 0.8395843672500001 0.537760627 1.1414081075 ZT4-7 1.8912519995 1.7894294834999998 1.9930745155 ZT8-11 2.2206175575 2.0490017465 2.3922333685 ZT12-15 3.25816163575 2.7659292229999997 3.7503940485000005 ZT16-19 3.71010870425 3.2136107029999996 4.2066067055000005 ZT20-23 5.1614615265 5.065455409 5.257467644