condition mean min max ZT0-3 29.85 29.85 29.85 ZT4-7 20.1 20.1 20.1 ZT8-11 18.05 18.05 18.05 ZT12-15 12.3 12.3 12.3 ZT16-19 25.05 25.05 25.05 ZT20-23 27.05 27.05 27.05