condition mean min max ZT0-3 46.950925 46.453950000000006 47.4479 ZT4-7 43.614599999999996 43.614599999999996 43.614599999999996 ZT8-11 41.5681 41.5681 41.5681 ZT12-15 0 0 0 ZT16-19 57.4718 57.4718 57.4718 ZT20-23 51.78485 51.78485 51.78485