condition mean min max ZT0-3 4.7 4.7 4.7 ZT4-7 2.8 2.8 2.8 ZT8-11 33.45 33.45 33.45 ZT12-15 20.6 20.6 20.6 ZT16-19 44.15 44.15 44.15 ZT20-23 12.15 12.15 12.15