condition mean min max ZT0-3 41.75 41.75 41.75 ZT4-7 27.2 27.2 27.2 ZT8-11 47.9 47.9 47.9 ZT12-15 79.6 79.6 79.6 ZT16-19 29.85 29.85 29.85 ZT20-23 9.05 9.05 9.05