condition mean min max ZT0-3 16.652974999999998 16.24265 17.063299999999998 ZT4-7 8.22122 8.22122 8.22122 ZT8-11 9.47311 9.47311 9.47311 ZT12-15 0 0 0 ZT16-19 12.7689 12.7689 12.7689 ZT20-23 13.76855 13.76855 13.76855