condition mean min max ZT0-3 9.65 9.65 9.65 ZT4-7 4.2 4.2 4.2 ZT8-11 1.75 1.75 1.75 ZT12-15 12.4 12.4 12.4 ZT16-19 7.15 7.15 7.15 ZT20-23 10.0 10.0 10.0