condition mean min max ZT0-3 110.9 110.9 110.9 ZT4-7 111.4 111.4 111.4 ZT8-11 115.9 115.9 115.9 ZT12-15 135.45 135.45 135.45 ZT16-19 138.7 138.7 138.7 ZT20-23 121.3 121.3 121.3