condition mean min max ZT0-3 41.95 41.95 41.95 ZT4-7 5.2 5.2 5.2 ZT8-11 32.05 32.05 32.05 ZT12-15 20.85 20.85 20.85 ZT16-19 13.2 13.2 13.2 ZT20-23 41.25 41.25 41.25