condition mean min max ZT0-3 2.3549550000000004 2.25882 2.45109 ZT4-7 1.065866 1.065866 1.065866 ZT8-11 0.13935655 0.13935655 0.13935655 ZT12-15 0 0 0 ZT16-19 0.3184065 0.3184065 0.3184065 ZT20-23 1.273749 1.273749 1.273749