condition mean min max ZT0-3 1.5304363333333333 1.36099 1.85589 ZT4-7 0.9927465 0.9927465 0.9927465 ZT8-11 1.5724399999999998 1.5724399999999998 1.5724399999999998 ZT12-15 2.15821 2.1180149999999998 2.198405 ZT16-19 2.264895 2.264895 2.264895 ZT20-23 2.16166 2.16166 2.16166