condition mean min max ZT0-3 347.29999999999995 347.29999999999995 347.29999999999995 ZT4-7 270.6 270.6 270.6 ZT8-11 243.85000000000002 243.85000000000002 243.85000000000002 ZT12-15 216.05 216.05 216.05 ZT16-19 208.9 208.9 208.9 ZT20-23 246.8 246.8 246.8