Redendant levels are most often called reference levels you can just replace 0's in
Estimate column with reference level note or change description of non-refrence levels e.g.
[country=1 vs 3] or make another footnote under your table saying "Reference levels: country=3, gender=1".
Basically I want to make a table which includes Estimates, Standard
error and significance. Can I somehow put country as one variable?
You can get significance of
country as one variable. You can't get
Std. error for it. Why? Just take a look on
country=1 means that in this country
OC_A_Total is on average
1.07 units higher than in reference country (
country=3), adjusting for
gender and the rest of your variables, of course. Similarly, you can say, that in
country=2 it is
1.005 units higher. These two
estimates can not be collapsed into one (at least if you still wish it to have some clear interpretation).