condition mean min max ZT0-3 151.513558 151.513558 151.513558 ZT4-7 151.969647 151.969647 151.969647 ZT8-11 111.147052 111.147052 111.147052 ZT12-15 135.421838 135.421838 135.421838 ZT16-19 142.361533 142.361533 142.361533 ZT20-23 164.370587 164.370587 164.370587