condition mean min max ZT0-3 7.85 7.85 7.85 ZT4-7 12.7 12.7 12.7 ZT8-11 2.9000000000000004 2.9000000000000004 2.9000000000000004 ZT12-15 25.3 25.3 25.3 ZT16-19 8.5 8.5 8.5 ZT20-23 5.25 5.25 5.25