condition mean min max ZT0-3 2.61142 2.50399 2.693775 ZT4-7 1.9135149999999999 1.9135149999999999 1.9135149999999999 ZT8-11 1.554415 1.554415 1.554415 ZT12-15 2.33963 2.13138 2.54788 ZT16-19 2.37076 2.37076 2.37076 ZT20-23 2.049485 2.049485 2.049485