condition mean min max ZT0-3 92.4 92.4 92.4 ZT4-7 88.7 88.7 88.7 ZT8-11 77.30000000000001 77.30000000000001 77.30000000000001 ZT12-15 67.6 67.6 67.6 ZT16-19 56.05 56.05 56.05 ZT20-23 60.75 60.75 60.75