condition mean min max ZT0-3 10.7 10.7 10.7 ZT4-7 2.7 2.7 2.7 ZT8-11 36.8 36.8 36.8 ZT12-15 18.8 18.8 18.8 ZT16-19 13.05 13.05 13.05 ZT20-23 4.5 4.5 4.5