condition mean min max ZT0-3 4.875982499999999 4.717874999999999 5.03409 ZT4-7 5.04829 5.04829 5.04829 ZT8-11 4.76865 4.76865 4.76865 ZT12-15 0 0 0 ZT16-19 4.7248850000000004 4.7248850000000004 4.7248850000000004 ZT20-23 6.145865 6.145865 6.145865