condition mean min max ZT0-3 0.95 0.95 0.95 ZT4-7 1.0 1.0 1.0 ZT8-11 9.2 9.2 9.2 ZT12-15 5.45 5.45 5.45 ZT16-19 2.5 2.5 2.5 ZT20-23 8.55 8.55 8.55