condition mean min max ZT0-3 20.25 20.25 20.25 ZT4-7 1.5 1.5 1.5 ZT8-11 7.15 7.15 7.15 ZT12-15 10.0 10.0 10.0 ZT16-19 10.85 10.85 10.85 ZT20-23 20.0 20.0 20.0