condition mean min max ZT0-3 29.7 29.7 29.7 ZT4-7 32.6 32.6 32.6 ZT8-11 28.45 28.45 28.45 ZT12-15 30.5 30.5 30.5 ZT16-19 26.0 26.0 26.0 ZT20-23 9.95 9.95 9.95