condition mean min max ZT0-3 9.9 9.9 9.9 ZT4-7 33.9 33.9 33.9 ZT8-11 4.7 4.7 4.7 ZT12-15 14.45 14.45 14.45 ZT16-19 9.9 9.9 9.9 ZT20-23 35.4 35.4 35.4