condition mean min max ZT0-3 1.1438028333333334 0.8395725 1.67443 ZT4-7 0.8030219999999999 0.8030219999999999 0.8030219999999999 ZT8-11 0.8996775 0.8996775 0.8996775 ZT12-15 1.40517025 0.9270754999999999 1.8832650000000002 ZT16-19 1.280295 1.280295 1.280295 ZT20-23 1.2864399999999998 1.2864399999999998 1.2864399999999998