condition mean min max ZT0-3 27.9 27.9 27.9 ZT4-7 11.6 11.6 11.6 ZT8-11 41.75 41.75 41.75 ZT12-15 37.449999999999996 37.449999999999996 37.449999999999996 ZT16-19 26.299999999999997 26.299999999999997 26.299999999999997 ZT20-23 34.7 34.7 34.7