condition mean min max ZT0-3 27.3 27.3 27.3 ZT4-7 10.9 10.9 10.9 ZT8-11 14.1 14.1 14.1 ZT12-15 26.1 26.1 26.1 ZT16-19 18.75 18.75 18.75 ZT20-23 48.449999999999996 48.449999999999996 48.449999999999996