condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 12.617337500000001 12.617337500000001 12.617337500000001 ZT8-11 9.8809925 9.8809925 9.8809925 ZT12-15 10.484986 10.484986 10.484986 ZT16-19 10.764261999999999 10.764261999999999 10.764261999999999 ZT20-23 10.894438000000001 10.894438000000001 10.894438000000001