condition mean min max ZT0-3 2.8087459999999997 2.8087459999999997 2.8087459999999997 ZT4-7 0.054761399999999995 0.054761399999999995 0.054761399999999995 ZT8-11 2.571464 2.571464 2.571464 ZT12-15 0.664173 0.664173 0.664173 ZT16-19 0.8306169999999999 0.8306169999999999 0.8306169999999999 ZT20-23 1.0337855 1.0337855 1.0337855