condition mean min max ZT0-3 9.94979 9.94979 9.94979 ZT4-7 10.23644 10.23644 10.23644 ZT8-11 12.27135 12.27135 12.27135 ZT12-15 15.577950000000001 15.577950000000001 15.577950000000001 ZT16-19 16.0172 16.0172 16.0172 ZT20-23 12.5273 12.5273 12.5273