condition mean min max ZT0-3 36.05 36.05 36.05 ZT4-7 71.6 71.6 71.6 ZT8-11 35.85 35.85 35.85 ZT12-15 20.9 20.9 20.9 ZT16-19 51.8 51.8 51.8 ZT20-23 63.0 63.0 63.0