condition mean min max ZT0-3 0.00983635 0.00983635 0.00983635 ZT4-7 0.1639618 0.1639618 0.1639618 ZT8-11 0.04080145 0.04080145 0.04080145 ZT12-15 0.03151495 0.03151495 0.03151495 ZT16-19 0.02368035 0.02368035 0.02368035 ZT20-23 0.0295627 0.0295627 0.0295627