condition mean min max ZT0-3 27.574925 26.7952 28.35465 ZT4-7 28.953200000000002 28.953200000000002 28.953200000000002 ZT8-11 34.9792 34.9792 34.9792 ZT12-15 0 0 0 ZT16-19 40.5539 40.5539 40.5539 ZT20-23 34.45675 34.45675 34.45675