condition mean min max ZT0-3 10.25 10.25 10.25 ZT4-7 6.0 6.0 6.0 ZT8-11 3.15 3.15 3.15 ZT12-15 3.3 3.3 3.3 ZT16-19 17.3 17.3 17.3 ZT20-23 2.15 2.15 2.15