condition mean min max ZT0-3 0.586418 0.586418 0.586418 ZT4-7 0.18729849999999998 0.18729849999999998 0.18729849999999998 ZT8-11 0.279706 0.279706 0.279706 ZT12-15 0.3278005 0.3278005 0.3278005 ZT16-19 0.294838 0.294838 0.294838 ZT20-23 0.526858 0.526858 0.526858