condition mean min max ZT0-3 58.01583333333333 49.257999999999996 63.35675 ZT4-7 42.4552 42.4552 42.4552 ZT8-11 54.1897 54.1897 54.1897 ZT12-15 62.22015 61.747499999999995 62.6928 ZT16-19 62.336749999999995 62.336749999999995 62.336749999999995 ZT20-23 76.31715 76.31715 76.31715