condition mean min max ZT0-3 65.63951666666667 42.3173 83.66215 ZT4-7 23.68715 23.68715 23.68715 ZT8-11 14.1958 14.1958 14.1958 ZT12-15 47.030874999999995 33.49755 60.5642 ZT16-19 46.24525 46.24525 46.24525 ZT20-23 64.45439999999999 64.45439999999999 64.45439999999999