condition mean min max ZT0-3 2.95 2.95 2.95 ZT4-7 22.5 22.5 22.5 ZT8-11 11.85 11.85 11.85 ZT12-15 5.1 5.1 5.1 ZT16-19 5.6 5.6 5.6 ZT20-23 22.5 22.5 22.5