condition mean min max ZT0-3 8.4943425 7.3776399999999995 9.611045 ZT4-7 6.752165 6.752165 6.752165 ZT8-11 8.506969999999999 8.506969999999999 8.506969999999999 ZT12-15 0 0 0 ZT16-19 11.34785 11.34785 11.34785 ZT20-23 10.409815 10.409815 10.409815