condition mean min max ZT0-3 28.75 28.75 28.75 ZT4-7 41.4 41.4 41.4 ZT8-11 15.05 15.05 15.05 ZT12-15 55.7 55.7 55.7 ZT16-19 15.9 15.9 15.9 ZT20-23 16.8 16.8 16.8