condition mean min max ZT0-3 23.45 23.45 23.45 ZT4-7 32.1 32.1 32.1 ZT8-11 29.65 29.65 29.65 ZT12-15 5.449999999999999 5.449999999999999 5.449999999999999 ZT16-19 18.45 18.45 18.45 ZT20-23 32.55 32.55 32.55