condition mean min max ZT0-3 25.1 25.1 25.1 ZT4-7 14.5 14.5 14.5 ZT8-11 4.7 4.7 4.7 ZT12-15 12.75 12.75 12.75 ZT16-19 8.05 8.05 8.05 ZT20-23 49.25 49.25 49.25