condition mean min max ZT0-3 9.5 9.5 9.5 ZT4-7 10.6 10.6 10.6 ZT8-11 12.5 12.5 12.5 ZT12-15 17.95 17.95 17.95 ZT16-19 26.9 26.9 26.9 ZT20-23 8.8 8.8 8.8