condition mean min max ZT0-3 3.2 3.2 3.2 ZT4-7 2.7 2.7 2.7 ZT8-11 21.6 21.6 21.6 ZT12-15 24.15 24.15 24.15 ZT16-19 14.85 14.85 14.85 ZT20-23 4.449999999999999 4.449999999999999 4.449999999999999