condition mean min max ZT0-3 11.18265 11.18265 11.18265 ZT4-7 2.2966499999999996 2.2966499999999996 2.2966499999999996 ZT8-11 1.78756 1.78756 1.78756 ZT12-15 3.482915 3.482915 3.482915 ZT16-19 16.59115 16.59115 16.59115 ZT20-23 21.13865 21.13865 21.13865