condition mean min max ZT0-3 2851.439912 2851.439912 2851.439912 ZT4-7 2814.324619 2814.324619 2814.324619 ZT8-11 3702.7983355 3702.7983355 3702.7983355 ZT12-15 2913.589336 2913.589336 2913.589336 ZT16-19 3631.8200770000003 3631.8200770000003 3631.8200770000003 ZT20-23 3199.8181050000003 3199.8181050000003 3199.8181050000003