condition mean min max ZT0-3 41.25 41.25 41.25 ZT4-7 22.3 22.3 22.3 ZT8-11 20.8 20.8 20.8 ZT12-15 27.3 27.3 27.3 ZT16-19 29.85 29.85 29.85 ZT20-23 28.65 28.65 28.65