condition mean min max ZT0-3 10.0 10.0 10.0 ZT4-7 2.8 2.8 2.8 ZT8-11 26.7 26.7 26.7 ZT12-15 12.35 12.35 12.35 ZT16-19 2.8 2.8 2.8 ZT20-23 15.6 15.6 15.6