Let $f = x^n + a_{n-1}x^n + \cdots + a_0$ be a monic polynomial of degree $n \geq 2$ with integer coefficients. By $\text{Gal}(f)$ we mean the Galois group over $\mathbb{Q}$ of the Galois closure of $f$. Define $H(f) = \max\{|a_i|\}$ denote the naive or box height of $f$. Hilbert's irreducibility theorem asserts that for most integer $n$-tuples $(a_0, \cdots, a_{n-1})$ with $H(f) \leq B$ say, the corresponding polynomial $f$ is irreducible. In fact it is conjectured that for all but $O(B^{n-1})$ many such polynomials, the Galois group of $f$ is isomorphic to the symmetric group $S_n$.

The best bounds to date, due to Rankin, assert that all but $O(B^{n-1/2})$ many monic polynomials with box height bounded by $B$ has Galois group isomorphic to $S_n$. David Zywina proved that one can sharpen this bound if one excludes those polynomials whose Galois group is the alternating group. Indeed, he showed that for every $\epsilon > 0$ there exists a number $N$ such that for all $n \geq N$, there are $O(B^{n-1+\epsilon})$ many monic polynomials of height at most $B$ which have Galois group distinct from $S_n$ and $A_n$.

What about lower bounds? Is it obvious that the alternating group should be the second most common Galois group, at least for all sufficiently large degrees? It is apparently a conjecture of Narkiewicz (from Carl Pomerance's talk https://math.dartmouth.edu/~carlp/PDF/fieldstalk.pdf) that the number of fields of degree $n$ over $\mathbb{Q}$ whose Galois group contains a transposition will constitute a positive proportion of all number fields of degree $n$. The alternating group conspicuously does not have any transpositions and so under this conjecture, $0\%$ of fields have Galois group equal to the alternating group. This to me makes it not so obvious why one would expect more polynomials with alternating Galois group as opposed to some other isomorphism class.

Are there known lower bounds for the number of polynomials with Galois group isomorphic to a subgroup of $A_n$, either with respect to the box height or otherwise?