condition mean min max ZT0-3 25.5 25.5 25.5 ZT4-7 22.6 22.6 22.6 ZT8-11 9.45 9.45 9.45 ZT12-15 16.75 16.75 16.75 ZT16-19 17.95 17.95 17.95 ZT20-23 17.75 17.75 17.75