condition mean min max ZT0-3 0.17623758525 0.08635288199999999 0.26612228849999997 ZT4-7 0.53755123875 0.158368811 0.9167336665 ZT8-11 5.94331501325 3.7869641290000002 8.0996658975 ZT12-15 8.117150528749999 7.791446709000001 8.4428543485 ZT16-19 2.85787666075 2.4167278845 3.299025437 ZT20-23 1.96275108275 1.8710930905 2.054409075