condition mean min max ZT0-3 0.9610281666666667 0.9003083333333334 1.021748 ZT4-7 1.84762 1.84762 1.84762 ZT8-11 1.8710499999999999 1.8710499999999999 1.8710499999999999 ZT12-15 2.4625062499999997 2.2047925 2.72022 ZT16-19 1.4472835000000002 1.0787736666666667 1.8157933333333334 ZT20-23 0 0 0