condition mean min max ZT0-3 1420.715123 1420.715123 1420.715123 ZT4-7 669.7982805 669.7982805 669.7982805 ZT8-11 672.3620395 672.3620395 672.3620395 ZT12-15 732.3834420000001 732.3834420000001 732.3834420000001 ZT16-19 433.45437300000003 433.45437300000003 433.45437300000003 ZT20-23 653.4122985 653.4122985 653.4122985