condition mean min max ZT0-3 18.45 18.45 18.45 ZT4-7 17.7 17.7 17.7 ZT8-11 28.6 28.6 28.6 ZT12-15 10.15 10.15 10.15 ZT16-19 10.5 10.5 10.5 ZT20-23 12.95 12.95 12.95