  We answer a question of S.~Todor\v{c}evi\'c and C.~Uzc\'ategui from
\cite{TU1} by showing that the only possible sequential orders of sequential
analytic groups are $1$ and $\omega_1$. Other results on the structure of
sequential analytic spaces and their relation to other classes of spaces are
given as well. In particular, we provide a full topological classification of
sequential analytic groups by showing that all such groups are either
metrizable or $k_\omega$-spaces, which, together with a result by Zelenyuk,
implies that there are exactly $\omega_1$ non homeomorphic analytic sequential
group topologies.
