condition mean min max ZT0-3 54.444900000000004 54.444900000000004 54.444900000000004 ZT4-7 39.026250000000005 39.026250000000005 39.026250000000005 ZT8-11 32.697050000000004 32.697050000000004 32.697050000000004 ZT12-15 38.590450000000004 38.590450000000004 38.590450000000004 ZT16-19 51.042950000000005 51.042950000000005 51.042950000000005 ZT20-23 58.2453 58.2453 58.2453