condition mean min max ZT0-3 34.25371699 33.744178680000005 34.7632553 ZT4-7 36.71584619833334 32.369058863333336 41.06263353333333 ZT8-11 35.28538480666666 34.50506131333333 36.0657083 ZT12-15 58.07068269 56.8411474 59.30021798 ZT16-19 58.668157525 57.33749612 59.99881893 ZT20-23 57.7307345 50.22177762 65.23969138