condition mean min max ZT0-3 134.85000000000002 134.85000000000002 134.85000000000002 ZT4-7 138.7 138.7 138.7 ZT8-11 128.85 128.85 128.85 ZT12-15 112.15 112.15 112.15 ZT16-19 205.60000000000002 205.60000000000002 205.60000000000002 ZT20-23 172.35 172.35 172.35