condition mean min max ZT0-3 35.9688341625 33.218903185 38.71876514 ZT4-7 27.476179547500003 26.09484992 28.857509175 ZT8-11 15.1696630835 11.208865387 19.13046078 ZT12-15 3.5148822695 2.3950242265 4.6347403125 ZT16-19 3.35597544525 3.1516164515 3.560334439 ZT20-23 5.3180750595 5.235909532999999 5.400240586