condition mean min max ZT0-3 6.812883333333334 4.36744 9.058735 ZT4-7 4.000585 4.000585 4.000585 ZT8-11 5.482425 5.482425 5.482425 ZT12-15 9.5468275 9.218535 9.875119999999999 ZT16-19 9.033325000000001 9.033325000000001 9.033325000000001 ZT20-23 11.676449999999999 11.676449999999999 11.676449999999999