condition mean min max ZT0-3 9.9 9.9 9.9 ZT4-7 2.6 2.6 2.6 ZT8-11 29.15 29.15 29.15 ZT12-15 16.75 16.75 16.75 ZT16-19 6.0 6.0 6.0 ZT20-23 2.65 2.65 2.65