1000SC #664

[samyak]

664. Some psychiatric studies indicate that among distinguished artists the rates of manic depression and major depression are ten to thirteen times as prevalent as in the population at large.
(A) the rates of manic depression and major depression are ten to thirteen times as prevalent as in
(B) the rates of manic depression and major depression are ten to thirteen times more prevalent than in
(C) the rates of manic depression and major depression are ten to thirteen times more prevalent when compared to
(D) manic depression and major depression are ten to thirteen times as prevalent when compared to
(E) manic depression and major depression are ten to thirteen times more prevalent than in

OA after few explanations.

[this_time_i_will]

IMO E. It should be "rates for" and not "rates of".
D: as prevalent when compared to is awkward.

[jube]

E - rate is redundant, hence A, B & C can be weeded out. "when compared to" is again redundant since prevalent says the same thing, hence D can be eliminated as well.

[missionGMAT007]

IMO E

'rates of' is acceptable here..
'rates for' should be used in the case when we mean 'price'

A, B, and C are wrong because we can not say - rates prevalent.