condition mean min max ZT0-3 815.35 815.35 815.35 ZT4-7 726.0 726.0 726.0 ZT8-11 828.4 828.4 828.4 ZT12-15 841.8 841.8 841.8 ZT16-19 853.3 853.3 853.3 ZT20-23 862.95 862.95 862.95