condition mean min max ZT0-3 29.5 29.5 29.5 ZT4-7 1.0 1.0 1.0 ZT8-11 25.2 25.2 25.2 ZT12-15 31.6 31.6 31.6 ZT16-19 26.1 26.1 26.1 ZT20-23 33.15 33.15 33.15