condition mean min max ZT0-3 21.35 21.35 21.35 ZT4-7 4.7 4.7 4.7 ZT8-11 4.4 4.4 4.4 ZT12-15 33.9 33.9 33.9 ZT16-19 8.4 8.4 8.4 ZT20-23 33.7 33.7 33.7