condition mean min max ZT0-3 16.9 16.9 16.9 ZT4-7 45.9 45.9 45.9 ZT8-11 67.7 67.7 67.7 ZT12-15 61.45 61.45 61.45 ZT16-19 15.7 15.7 15.7 ZT20-23 23.85 23.85 23.85