condition mean min max ZT0-3 30.5 30.5 30.5 ZT4-7 32.6 32.6 32.6 ZT8-11 25.85 25.85 25.85 ZT12-15 33.45 33.45 33.45 ZT16-19 4.7 4.7 4.7 ZT20-23 19.4 19.4 19.4