condition mean min max ZT0-3 2.4 2.4 2.4 ZT4-7 6.3 6.3 6.3 ZT8-11 6.75 6.75 6.75 ZT12-15 2.9 2.9 2.9 ZT16-19 8.9 8.9 8.9 ZT20-23 5.449999999999999 5.449999999999999 5.449999999999999