condition mean min max ZT0-3 35.1 35.1 35.1 ZT4-7 6.5 6.5 6.5 ZT8-11 55.65 55.65 55.65 ZT12-15 22.1 22.1 22.1 ZT16-19 28.6 28.6 28.6 ZT20-23 5.9 5.9 5.9