condition mean min max ZT0-3 2.01728910175 1.3451589769999999 2.6894192265 ZT4-7 4.3943178275 3.7691798585000003 5.019455796500001 ZT8-11 5.292835204749999 4.626707380999999 5.9589630284999995 ZT12-15 6.045856163 5.574318443499999 6.5173938824999995 ZT16-19 5.381074459000001 4.620530951000001 6.141617967 ZT20-23 10.2815104125 9.067106185 11.495914639999999